diff --git a/client/implementation/src/main/java/io/smallrye/graphql/client/impl/TypesafeClientConfigurationReader.java b/client/implementation/src/main/java/io/smallrye/graphql/client/impl/TypesafeClientConfigurationReader.java
index da889faed..89c886b28 100644
--- a/client/implementation/src/main/java/io/smallrye/graphql/client/impl/TypesafeClientConfigurationReader.java
+++ b/client/implementation/src/main/java/io/smallrye/graphql/client/impl/TypesafeClientConfigurationReader.java
@@ -2,6 +2,7 @@
 
 import static io.smallrye.graphql.client.impl.GraphQLClientsConfiguration.getConfiguredHeaders;
 
+import java.util.HashMap;
 import java.util.Optional;
 
 import org.eclipse.microprofile.config.Config;
@@ -44,6 +45,7 @@ private void buildUrl() {
 
     private void buildHeaders() {
         clientConfiguration.setHeaders(getConfiguredHeaders(configKey, mpConfig));
+        clientConfiguration.setDynamicHeaders(new HashMap<>());
     }
 
     GraphQLClientConfiguration getClientConfiguration() {