diff --git a/stepmania/src/archutils/Darwin/arch_setup.h b/stepmania/src/archutils/Darwin/arch_setup.h
index e6eeca6c3b..a0c654c8bc 100644
--- a/stepmania/src/archutils/Darwin/arch_setup.h
+++ b/stepmania/src/archutils/Darwin/arch_setup.h
@@ -10,3 +10,4 @@
 #define HAVE_VERSION_INFO
 #define HAVE_CXA_DEMANGLE
 #define _BSD_WCHAR_T_DEFINED_
+extern long long llabs(long long i);