diff --git a/runtime/Makefile b/runtime/Makefile
index 8408392f2..262193c14 100644
--- a/runtime/Makefile
+++ b/runtime/Makefile
@@ -1,5 +1,5 @@
 CC=clang
-COMMON_FLAGS=-g2 -std=gnu99 -fstack-protector-all -Wno-error=implicit-function-declaration
+COMMON_FLAGS=-g2 -std=gnu99 -fstack-protector-all -Wno-error=implicit-function-declaration -target X86_64-apple-macho
 PROD_FLAGS=$(COMMON_FLAGS) -DLAMA_ENV
 TEST_FLAGS=$(COMMON_FLAGS) -DDEBUG_VERSION
 UNIT_TESTS_FLAGS=$(TEST_FLAGS)