diff --git a/gcc/cp/Make-lang.in b/gcc/cp/Make-lang.in
index 4890a9476e8..47cf4de18cc 100644
--- a/gcc/cp/Make-lang.in
+++ b/gcc/cp/Make-lang.in
@@ -165,7 +165,7 @@ cplib2.txt: $(CXX_LIB2SRCS) $(CXX_EXTRA_HEADERS) cplib2.ready
 	mv -f cplib2.new cplib2.txt 
 
 # Or if it would be different.
-cplib2.ready: $(GCC_PASSES) $(LIBGCC2_DEPS) stmp-int-hdrs
+cplib2.ready: $(GCC_PASSES) $(LANGUAGES) $(LIBGCC2_DEPS) stmp-int-hdrs
 	@if [ -r cplib2.txt ]; then \
 	  if [ -f cc1plus ]; then \
 	    echo $(CXX_LIB2FUNCS) > cplib2.new; \