diff --git a/objectivec/GPBRootObject.m b/objectivec/GPBRootObject.m
index 98d77bee36f37..7f5e4ab7afef8 100644
--- a/objectivec/GPBRootObject.m
+++ b/objectivec/GPBRootObject.m
@@ -154,7 +154,7 @@ static id ExtensionForName(id self, SEL _cmd) {
 
   const char *className = class_getName(self);
   size_t classNameLen = strlen(className);
-  char key[classNameLen + selNameLen + 2];
+  char *key = alloca(classNameLen + selNameLen + 2);
   memcpy(key, className, classNameLen);
   key[classNameLen] = '_';
   memcpy(&key[classNameLen + 1], selName, selNameLen);
diff --git a/python/BUILD.bazel b/python/BUILD.bazel
index b5376ebdd6e65..11a19cdb0687a 100644
--- a/python/BUILD.bazel
+++ b/python/BUILD.bazel
@@ -111,7 +111,6 @@ py_extension(
     copts = UPB_DEFAULT_COPTS + select(LIMITED_API_FLAG_SELECT) + [
         # The Python API requires patterns that are ISO C incompatible, like
         # casts between function pointers and object pointers.
-        "-Wno-pedantic",
     ],
     features = UPB_DEFAULT_FEATURES,
     target_compatible_with = select(_message_target_compatible_with),