diff --git a/common.mk b/common.mk
index 037be3d1ee..e5cb5f8145 100644
--- a/common.mk
+++ b/common.mk
@@ -2196,6 +2196,7 @@ string.$(OBJEXT): {$(VPATH)}defines.h
 string.$(OBJEXT): {$(VPATH)}encindex.h
 string.$(OBJEXT): {$(VPATH)}encoding.h
 string.$(OBJEXT): {$(VPATH)}gc.h
+string.$(OBJEXT): {$(VPATH)}id.h
 string.$(OBJEXT): {$(VPATH)}intern.h
 string.$(OBJEXT): {$(VPATH)}internal.h
 string.$(OBJEXT): {$(VPATH)}io.h