diff --git a/common.mk b/common.mk
index 537d4dda..43949059 100644
--- a/common.mk
+++ b/common.mk
@@ -68,7 +68,10 @@ CPPFLAGS += -DPCRE_HAS_UCP=1
 endif
 
 LIBS += -lm
+# Darwin (Mac OS X) doesn’t have librt
+ifneq ($(UNAME),Darwin)
 LIBS += -lrt
+endif
 LIBS += -L $(TOPDIR)/libi3 -li3
 LIBS += $(call ldflags_for_lib, xcb-event,xcb-event)
 LIBS += $(call ldflags_for_lib, xcb-keysyms,xcb-keysyms)