diff --git a/m4/check-package.m4 b/m4/check-package.m4
index 717c5c0be7de1f2aba75e2a515a1cafa3233102f..6699705831256fa246171a5fa2bb66f5978cfc52 100644
--- a/m4/check-package.m4
+++ b/m4/check-package.m4
@@ -108,7 +108,7 @@ else
   else
     AC_CHECK_HEADERS($5,, AC_MSG_ERROR([Header file "$5" was not found]))
   fi
-  CPPCLAGS="${[ac_]m4_bpatsubst([$1],-,_)_save_CPPFLAGS}"
+  CPPFLAGS="${[ac_]m4_bpatsubst([$1],-,_)_save_CPPFLAGS}"
   dnl
   dnl define makefile substitutions and config.h macros
   dnl