diff --git a/stepmania/src/archutils/Darwin/arch_setup.h b/stepmania/src/archutils/Darwin/arch_setup.h
index a0c654c8bc..2a81fe7de5 100644
--- a/stepmania/src/archutils/Darwin/arch_setup.h
+++ b/stepmania/src/archutils/Darwin/arch_setup.h
@@ -10,4 +10,7 @@
 #define HAVE_VERSION_INFO
 #define HAVE_CXA_DEMANGLE
 #define _BSD_WCHAR_T_DEFINED_
-extern long long llabs(long long i);
+extern "C"
+{
+    extern long long llabs(long long i);
+}