diff --git a/c++tools/Makefile.in b/c++tools/Makefile.in
index 87f9236c203..7dc67ad9e06 100644
--- a/c++tools/Makefile.in
+++ b/c++tools/Makefile.in
@@ -29,7 +29,7 @@ AUTOHEADER := @AUTOHEADER@
 CXX := @CXX@
 CXXFLAGS := @CXXFLAGS@
 CXXOPTS := $(CXXFLAGS) -fno-exceptions -fno-rtti
-EXEEXT := @EXEEXT@
+exeext := @EXEEXT@
 LIBIBERTY := ../libiberty/libiberty.a
 VERSION.O := ../gcc/version.o