diff --git a/extensions/oidc-client/runtime/src/main/java/io/quarkus/oidc/client/OidcClientConfig.java b/extensions/oidc-client/runtime/src/main/java/io/quarkus/oidc/client/OidcClientConfig.java
index 832a012974abb..975168eaf5abb 100644
--- a/extensions/oidc-client/runtime/src/main/java/io/quarkus/oidc/client/OidcClientConfig.java
+++ b/extensions/oidc-client/runtime/src/main/java/io/quarkus/oidc/client/OidcClientConfig.java
@@ -159,6 +159,12 @@ public void setExpiresInProperty(String expiresInProperty) {
     @ConfigItem(defaultValue = "true")
     public boolean earlyTokensAcquisition = true;
 
+    /**
+     * Custom HTTP headers which have to be sent to the token endpoint
+     */
+    @ConfigItem
+    public Map<String, String> headers;
+
     public Optional<String> getId() {
         return id;
     }
@@ -198,4 +204,12 @@ public Optional<Duration> getRefreshTokenTimeSkew() {
     public void setRefreshTokenTimeSkew(Duration refreshTokenTimeSkew) {
         this.refreshTokenTimeSkew = Optional.of(refreshTokenTimeSkew);
     }
+
+    public Map<String, String> getHeaders() {
+        return headers;
+    }
+
+    public void setHeaders(Map<String, String> headers) {
+        this.headers = headers;
+    }
 }
diff --git a/extensions/oidc-client/runtime/src/main/java/io/quarkus/oidc/client/runtime/OidcClientImpl.java b/extensions/oidc-client/runtime/src/main/java/io/quarkus/oidc/client/runtime/OidcClientImpl.java
index 63bf8b9805211..27978c01c4908 100644
--- a/extensions/oidc-client/runtime/src/main/java/io/quarkus/oidc/client/runtime/OidcClientImpl.java
+++ b/extensions/oidc-client/runtime/src/main/java/io/quarkus/oidc/client/runtime/OidcClientImpl.java
@@ -88,6 +88,11 @@ public Uni<Tokens> get() {
                 HttpRequest<Buffer> request = client.postAbs(tokenRequestUri);
                 request.putHeader(HttpHeaders.CONTENT_TYPE.toString(),
                         HttpHeaders.APPLICATION_X_WWW_FORM_URLENCODED.toString());
+                if (oidcConfig.headers != null) {
+                    for (Map.Entry<String, String> headerEntry : oidcConfig.headers.entrySet()) {
+                        request.putHeader(headerEntry.getKey(), headerEntry.getValue());
+                    }
+                }
                 if (clientSecretBasicAuthScheme != null) {
                     request.putHeader(AUTHORIZATION_HEADER, clientSecretBasicAuthScheme);
                 } else if (clientJwtKey != null) {
diff --git a/integration-tests/oidc-client-wiremock/src/main/java/io/quarkus/it/keycloak/FrontendResource.java b/integration-tests/oidc-client-wiremock/src/main/java/io/quarkus/it/keycloak/FrontendResource.java
index e6f7da8c2d6b2..2c6bacdc96380 100644
--- a/integration-tests/oidc-client-wiremock/src/main/java/io/quarkus/it/keycloak/FrontendResource.java
+++ b/integration-tests/oidc-client-wiremock/src/main/java/io/quarkus/it/keycloak/FrontendResource.java
@@ -5,10 +5,13 @@
 import javax.ws.rs.Path;
 import javax.ws.rs.Produces;
 import javax.ws.rs.QueryParam;
+import javax.ws.rs.WebApplicationException;
 
 import org.eclipse.microprofile.rest.client.inject.RestClient;
 
 import io.quarkus.oidc.client.NamedOidcClient;
+import io.quarkus.oidc.client.OidcClient;
+import io.quarkus.oidc.client.OidcClientException;
 import io.quarkus.oidc.client.OidcClients;
 import io.quarkus.oidc.client.Tokens;
 import io.smallrye.mutiny.Uni;
@@ -23,6 +26,10 @@ public class FrontendResource {
     @NamedOidcClient("non-standard-response")
     Tokens tokens;
 
+    @Inject
+    @NamedOidcClient("non-standard-response-without-header")
+    OidcClient tokensWithoutHeader;
+
     @Inject
     OidcClients clients;
 
@@ -35,7 +42,18 @@ public String echoToken() {
     @GET
     @Path("echoTokenNonStandardResponse")
     public String echoTokenNonStandardResponse() {
-        return tokens.getAccessToken() + " " + tokens.getRefreshToken();
+        try {
+            return tokens.getAccessToken() + " " + tokens.getRefreshToken();
+        } catch (OidcClientException ex) {
+            throw new WebApplicationException(401);
+        }
+    }
+
+    @GET
+    @Path("echoTokenNonStandardResponseWithoutHeader")
+    public Uni<Tokens> echoTokenNonStandardResponseWithoutHeader() {
+        return tokensWithoutHeader.getTokens().onFailure(OidcClientException.class)
+                .transform(t -> new WebApplicationException(401));
     }
 
     @GET
diff --git a/integration-tests/oidc-client-wiremock/src/main/resources/application.properties b/integration-tests/oidc-client-wiremock/src/main/resources/application.properties
index 33370bbd44517..d7f48a4442734 100644
--- a/integration-tests/oidc-client-wiremock/src/main/resources/application.properties
+++ b/integration-tests/oidc-client-wiremock/src/main/resources/application.properties
@@ -18,6 +18,19 @@ quarkus.oidc-client.non-standard-response.grant.refresh-token-property=refreshTo
 quarkus.oidc-client.non-standard-response.grant.expires-in-property=expiresIn
 quarkus.oidc-client.non-standard-response.grant-options.password.username=alice
 quarkus.oidc-client.non-standard-response.grant-options.password.password=alice
+quarkus.oidc-client.non-standard-response.headers.X-Custom=XCustomHeaderValue
+
+quarkus.oidc-client.non-standard-response-without-header.auth-server-url=${keycloak.url}
+quarkus.oidc-client.non-standard-response-without-header.discovery-enabled=false
+quarkus.oidc-client.non-standard-response-without-header.token-path=/non-standard-tokens
+quarkus.oidc-client.non-standard-response-without-header.client-id=quarkus-app
+quarkus.oidc-client.non-standard-response-without-header.credentials.secret=secret
+quarkus.oidc-client.non-standard-response-without-header.grant.type=password
+quarkus.oidc-client.non-standard-response-without-header.grant.access-token-property=accessToken
+quarkus.oidc-client.non-standard-response-without-header.grant.refresh-token-property=refreshToken
+quarkus.oidc-client.non-standard-response-without-header.grant.expires-in-property=expiresIn
+quarkus.oidc-client.non-standard-response-without-header.grant-options.password.username=alice
+quarkus.oidc-client.non-standard-response-without-header.grant-options.password.password=alice
 
 quarkus.oidc-client.refresh.auth-server-url=${keycloak.url}
 quarkus.oidc-client.refresh.discovery-enabled=false
diff --git a/integration-tests/oidc-client-wiremock/src/test/java/io/quarkus/it/keycloak/KeycloakRealmResourceManager.java b/integration-tests/oidc-client-wiremock/src/test/java/io/quarkus/it/keycloak/KeycloakRealmResourceManager.java
index a8aef8f8c2f1f..93a509926d7e5 100644
--- a/integration-tests/oidc-client-wiremock/src/test/java/io/quarkus/it/keycloak/KeycloakRealmResourceManager.java
+++ b/integration-tests/oidc-client-wiremock/src/test/java/io/quarkus/it/keycloak/KeycloakRealmResourceManager.java
@@ -36,6 +36,7 @@ public Map<String, String> start() {
                         .withBody(
                                 "{\"access_token\":\"access_token_1\", \"expires_in\":4, \"refresh_token\":\"refresh_token_1\"}")));
         server.stubFor(WireMock.post("/non-standard-tokens")
+                .withHeader("X-Custom", matching("XCustomHeaderValue"))
                 .withRequestBody(matching("grant_type=password&username=alice&password=alice"))
                 .willReturn(WireMock
                         .aResponse()
diff --git a/integration-tests/oidc-client-wiremock/src/test/java/io/quarkus/it/keycloak/OidcClientTest.java b/integration-tests/oidc-client-wiremock/src/test/java/io/quarkus/it/keycloak/OidcClientTest.java
index 7d4c45df61bd5..f5a955b8549a4 100644
--- a/integration-tests/oidc-client-wiremock/src/test/java/io/quarkus/it/keycloak/OidcClientTest.java
+++ b/integration-tests/oidc-client-wiremock/src/test/java/io/quarkus/it/keycloak/OidcClientTest.java
@@ -61,6 +61,13 @@ public void testEchoTokensNonStandardResponse() {
                 .body(equalTo("access_token_n refresh_token_n"));
     }
 
+    @Test
+    public void testEchoTokensNonStandardResponseWithoutHeader() {
+        RestAssured.when().get("/frontend/echoTokenNonStandardResponseWithoutHeader")
+                .then()
+                .statusCode(401);
+    }
+
     @Test
     public void testEchoTokensRefreshTokenOnly() {
         RestAssured.given().queryParam("refreshToken", "shared_refresh_token")