diff --git a/toolkit/library/Makefile.in b/toolkit/library/Makefile.in
index d0d29a6e42c..96cc857dd75 100644
--- a/toolkit/library/Makefile.in
+++ b/toolkit/library/Makefile.in
@@ -102,12 +102,17 @@ ifeq ($(OS_ARCH),WINNT)
 CPPSRCS += dlldeps-javaxpcom.cpp
 LOCAL_INCLUDES += -I$(JAVA_INCLUDE_PATH)/win32
 else
+ifeq ($(OS_ARCH),OS2)
+CPPSRCS += dlldeps-javaxpcom.cpp
+LOCAL_INCLUDES += -I$(JAVA_INCLUDE_PATH)/os2
+else
 ifneq (,$(filter mac cocoa,$(MOZ_WIDGET_TOOLKIT)))
 EXTRA_DSO_LDOPTS += -framework JavaVM
 else
 LOCAL_INCLUDES += -I$(JAVA_INCLUDE_PATH)/linux
 endif
 endif
+endif
 
 SHARED_LIBRARY_LIBS += \
   $(DEPTH)/extensions/java/xpcom/src/$(LIB_PREFIX)javaxpcom.$(LIB_SUFFIX)