diff --git a/libavcodec/videotoolboxenc.c b/libavcodec/videotoolboxenc.c
index 9b7ee6720c..8a02d3d1a0 100644
--- a/libavcodec/videotoolboxenc.c
+++ b/libavcodec/videotoolboxenc.c
@@ -49,6 +49,10 @@ enum { kCVPixelFormatType_420YpCbCr10BiPlanarFullRange = 'xf20' };
 enum { kCVPixelFormatType_420YpCbCr10BiPlanarVideoRange = 'x420' };
 #endif
 
+#ifndef TARGET_CPU_ARM64
+#   define TARGET_CPU_ARM64 0
+#endif
+
 typedef OSStatus (*getParameterSetAtIndex)(CMFormatDescriptionRef videoDesc,
                                            size_t parameterSetIndex,
                                            const uint8_t **parameterSetPointerOut,