diff --git a/src/main/java/com/ibm/cloud/sdk/core/service/BaseService.java b/src/main/java/com/ibm/cloud/sdk/core/service/BaseService.java
index 4bd1a9758..3b531c03a 100644
--- a/src/main/java/com/ibm/cloud/sdk/core/service/BaseService.java
+++ b/src/main/java/com/ibm/cloud/sdk/core/service/BaseService.java
@@ -86,9 +86,9 @@ public abstract class BaseService {
 
   // Regular expression for JSON-related mimetypes.
   protected static final Pattern JSON_MIME_PATTERN =
-    Pattern.compile("(?i)application\\/((json)|(merge\\-patch\\+json))(;.*)?");
+    Pattern.compile("(?i)application\\/((json)|(merge\\-patch\\+json))(\\s*;.*)?");
   protected static final Pattern JSON_PATCH_MIME_PATTERN =
-    Pattern.compile("(?i)application\\/json\\-patch\\+json(;.*)?");
+    Pattern.compile("(?i)application\\/json\\-patch\\+json(\\s*;.*)?");
 
   // Hide the default ctor to prevent clients from calling it directly.
   protected BaseService() {
diff --git a/src/test/java/com/ibm/cloud/sdk/core/test/service/BaseServiceTest.java b/src/test/java/com/ibm/cloud/sdk/core/test/service/BaseServiceTest.java
index b0d0fc83d..d6a6647dc 100644
--- a/src/test/java/com/ibm/cloud/sdk/core/test/service/BaseServiceTest.java
+++ b/src/test/java/com/ibm/cloud/sdk/core/test/service/BaseServiceTest.java
@@ -81,6 +81,7 @@ public void testMimeTypes() {
     assertFalse(BaseService.isJsonPatchMimeType(null));
     assertTrue(BaseService.isJsonMimeType("application/json"));
     assertTrue(BaseService.isJsonMimeType("application/json; charset=utf-8"));
+    assertTrue(BaseService.isJsonMimeType("application/json ;charset=utf-8"));
     assertTrue(BaseService.isJsonMimeType("application/json;charset=utf-8"));
     assertTrue(BaseService.isJsonMimeType("APPLICATION/JSON;charset=utf-16"));
     assertFalse(BaseService.isJsonMimeType("application/notjson"));
@@ -95,6 +96,7 @@ public void testMimeTypes() {
 
     assertTrue(BaseService.isJsonPatchMimeType("application/json-patch+json"));
     assertTrue(BaseService.isJsonPatchMimeType("application/json-patch+json;charset=utf-8"));
+    assertTrue(BaseService.isJsonPatchMimeType("application/json-patch+json ; charset=utf-8"));
     assertFalse(BaseService.isJsonPatchMimeType("application/json"));
     assertFalse(BaseService.isJsonPatchMimeType("APPLICATION/JsOn; charset=utf-8"));
     assertFalse(BaseService.isJsonPatchMimeType("application/merge-patch+json"));