diff --git a/externals/ffmpeg/CMakeLists.txt b/externals/ffmpeg/CMakeLists.txt
index 9387ab3db0..f91e58bdaa 100644
--- a/externals/ffmpeg/CMakeLists.txt
+++ b/externals/ffmpeg/CMakeLists.txt
@@ -203,8 +203,8 @@ else()
         )
     elseif(IOS)
         execute_process(COMMAND xcrun --sdk iphoneos --show-sdk-path OUTPUT_VARIABLE SYSROOT)
-        set(FFmpeg_CC "xcrun --sdk iphoneos clang -arch arm64")
-        set(FFmpeg_CXX "xcrun --sdk iphoneos clang++ -arch arm64")
+        set(FFmpeg_CC xcrun --sdk iphoneos clang -arch arm64)
+        set(FFmpeg_CXX xcrun --sdk iphoneos clang++ -arch arm64)
         list(APPEND FFmpeg_CROSS_COMPILE_FLAGS
             --arch=arm64
             --enable-cross-compile