diff --git a/modules/opus/SCsub b/modules/opus/SCsub
index aa656c575ae..b72144c679f 100644
--- a/modules/opus/SCsub
+++ b/modules/opus/SCsub
@@ -220,10 +220,15 @@ if env['builtin_opus']:
     ]
     env_opus.Append(CPPPATH=[thirdparty_dir + "/" + dir for dir in thirdparty_include_paths])
 
-    if env["platform"] == "android" or env["platform"] == "iphone":
-        if ("arch" in env and env["arch"] == "arm") or ("android_arch" in env and env["android_arch"] in ["armv6", "armv7"]):
+    if env["platform"] == "android":
+        if ("android_arch" in env and env["android_arch"] in ["armv6", "armv7"]):
             env_opus.Append(CFLAGS=["-DOPUS_ARM_OPT"])
-        elif ("arch" in env and env["arch"] == "arm64") or ("android_arch" in env and env["android_arch"] == "arm64v8"):
+        elif ("android_arch" in env and env["android_arch"] == "arm64v8"):
+            env_opus.Append(CFLAGS=["-DOPUS_ARM64_OPT"])
+    elif env["platform"] == "iphone":
+        if ("arch" in env and env["arch"] == "arm"):
+            env_opus.Append(CFLAGS=["-DOPUS_ARM_OPT"])
+        elif ("arch" in env and env["arch"] == "arm64"):
             env_opus.Append(CFLAGS=["-DOPUS_ARM64_OPT"])
 
     env_thirdparty = env_opus.Clone()