diff --git a/src/crypto/CMakeLists.txt b/src/crypto/CMakeLists.txt
index 3b33fe90a..3f0f7d34b 100644
--- a/src/crypto/CMakeLists.txt
+++ b/src/crypto/CMakeLists.txt
@@ -116,6 +116,7 @@ endif()
 
 # cheat because cmake and ccache hate each other
 set_property(SOURCE CryptonightR_template.S PROPERTY LANGUAGE C)
+set_property(SOURCE CryptonightR_template.S PROPERTY XCODE_EXPLICIT_FILE_TYPE sourcecode.asm)
 
 # Must be done last, because it references libraries in this directory
 add_subdirectory(wallet)