diff --git a/packages/google-cloud-securitycenter/src/v1/security_center_client.ts b/packages/google-cloud-securitycenter/src/v1/security_center_client.ts
index ba058929a70..49a9f54c15a 100644
--- a/packages/google-cloud-securitycenter/src/v1/security_center_client.ts
+++ b/packages/google-cloud-securitycenter/src/v1/security_center_client.ts
@@ -110,14 +110,11 @@ export class SecurityCenterClient {
     // const showcaseClient = new showcaseClient({ projectId, customConfig });
     opts.clientConfig = opts.clientConfig || {};
 
-    const isBrowser = typeof window !== 'undefined';
-    if (isBrowser) {
-      opts.fallback = true;
-    }
-    // If we are in browser, we are already using fallback because of the
-    // "browser" field in package.json.
-    // But if we were explicitly requested to use fallback, let's do it now.
-    this._gaxModule = !isBrowser && opts.fallback ? gax.fallback : gax;
+    // If we're running in browser, it's OK to omit `fallback` since
+    // google-gax has `browser` field in its `package.json`.
+    // For Electron (which does not respect `browser` field),
+    // pass `{fallback: true}` to the SecurityCenterClient constructor.
+    this._gaxModule = opts.fallback ? gax.fallback : gax;
 
     // Create a `gaxGrpc` object, with any grpc-specific options
     // sent to the client.
diff --git a/packages/google-cloud-securitycenter/src/v1beta1/security_center_client.ts b/packages/google-cloud-securitycenter/src/v1beta1/security_center_client.ts
index 60b2a87504d..893485e0465 100644
--- a/packages/google-cloud-securitycenter/src/v1beta1/security_center_client.ts
+++ b/packages/google-cloud-securitycenter/src/v1beta1/security_center_client.ts
@@ -110,14 +110,11 @@ export class SecurityCenterClient {
     // const showcaseClient = new showcaseClient({ projectId, customConfig });
     opts.clientConfig = opts.clientConfig || {};
 
-    const isBrowser = typeof window !== 'undefined';
-    if (isBrowser) {
-      opts.fallback = true;
-    }
-    // If we are in browser, we are already using fallback because of the
-    // "browser" field in package.json.
-    // But if we were explicitly requested to use fallback, let's do it now.
-    this._gaxModule = !isBrowser && opts.fallback ? gax.fallback : gax;
+    // If we're running in browser, it's OK to omit `fallback` since
+    // google-gax has `browser` field in its `package.json`.
+    // For Electron (which does not respect `browser` field),
+    // pass `{fallback: true}` to the SecurityCenterClient constructor.
+    this._gaxModule = opts.fallback ? gax.fallback : gax;
 
     // Create a `gaxGrpc` object, with any grpc-specific options
     // sent to the client.
diff --git a/packages/google-cloud-securitycenter/src/v1p1beta1/security_center_client.ts b/packages/google-cloud-securitycenter/src/v1p1beta1/security_center_client.ts
index 5b896d81fbd..6998c02b1bf 100644
--- a/packages/google-cloud-securitycenter/src/v1p1beta1/security_center_client.ts
+++ b/packages/google-cloud-securitycenter/src/v1p1beta1/security_center_client.ts
@@ -110,14 +110,11 @@ export class SecurityCenterClient {
     // const showcaseClient = new showcaseClient({ projectId, customConfig });
     opts.clientConfig = opts.clientConfig || {};
 
-    const isBrowser = typeof window !== 'undefined';
-    if (isBrowser) {
-      opts.fallback = true;
-    }
-    // If we are in browser, we are already using fallback because of the
-    // "browser" field in package.json.
-    // But if we were explicitly requested to use fallback, let's do it now.
-    this._gaxModule = !isBrowser && opts.fallback ? gax.fallback : gax;
+    // If we're running in browser, it's OK to omit `fallback` since
+    // google-gax has `browser` field in its `package.json`.
+    // For Electron (which does not respect `browser` field),
+    // pass `{fallback: true}` to the SecurityCenterClient constructor.
+    this._gaxModule = opts.fallback ? gax.fallback : gax;
 
     // Create a `gaxGrpc` object, with any grpc-specific options
     // sent to the client.
diff --git a/packages/google-cloud-securitycenter/synth.metadata b/packages/google-cloud-securitycenter/synth.metadata
index 8934c3e4615..9e472db0113 100644
--- a/packages/google-cloud-securitycenter/synth.metadata
+++ b/packages/google-cloud-securitycenter/synth.metadata
@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/nodejs-security-center.git",
-        "sha": "20e4b1e59990902c7d48310fd452d8709d63743c"
+        "sha": "41bd2a92dbed2041ef5d5def1b3ce0c22b670b12"
       }
     },
     {
@@ -19,7 +19,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "1c92077459db3dc50741e878f98b08c6261181e0"
+        "sha": "e7034945fbdc0e79d3c57f6e299e5c90b0f11469"
       }
     }
   ],