diff --git a/dtool/src/build/Makefile.o.rules b/dtool/src/build/Makefile.o.rules
index 65f804e841..c2a456a9ea 100644
--- a/dtool/src/build/Makefile.o.rules
+++ b/dtool/src/build/Makefile.o.rules
@@ -226,7 +226,7 @@ ifeq (,$(IGATEMODULE))
 IGATEMODULE := $(DEFERRED_TARGET)
 endif
 ifeq (,$(IGATEMODULE))
-IGATEMODULE := $(IGATELIBRARY)
+IGATEMODULE := $(patsubst lib%,%,$(IGATELIBRARY))
 endif
 
 ifeq (,$(IGATEDBFILE))