diff --git a/gfx/common/metal/metal_common.h b/gfx/common/metal/metal_common.h
index 3b216a619a..0b5020d07b 100644
--- a/gfx/common/metal/metal_common.h
+++ b/gfx/common/metal/metal_common.h
@@ -52,13 +52,12 @@ typedef NS_ENUM(NSUInteger, RPixelFormat)
    RPixelFormatB5G6R5Unorm,
 
    RPixelFormatBGRA8Unorm,
-   RPixelFormatBGRX8Unorm, // RetroArch XRGB
+   RPixelFormatBGRX8Unorm, /* RetroArch XRGB */
 
    RPixelFormatCount,
 };
 
 extern NSUInteger RPixelFormatToBPP(RPixelFormat format);
-extern NSString *NSStringFromRPixelFormat(RPixelFormat format);
 
 typedef NS_ENUM(NSUInteger, RTextureFilter)
 {
diff --git a/gfx/common/metal/metal_renderer.m b/gfx/common/metal/metal_renderer.m
index 9562976eb9..7ef27e5d85 100644
--- a/gfx/common/metal/metal_renderer.m
+++ b/gfx/common/metal/metal_renderer.m
@@ -33,6 +33,8 @@
  * COMMON
  */
 
+static NSString *RPixelStrings[RPixelFormatCount];
+
 NSUInteger RPixelFormatToBPP(RPixelFormat format)
 {
    switch (format)
@@ -51,9 +53,7 @@ NSUInteger RPixelFormatToBPP(RPixelFormat format)
    }
 }
 
-static NSString *RPixelStrings[RPixelFormatCount];
-
-NSString *NSStringFromRPixelFormat(RPixelFormat format)
+static NSString *NSStringFromRPixelFormat(RPixelFormat format)
 {
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{