diff --git a/src/mono/cmake/configure.cmake b/src/mono/cmake/configure.cmake
index fa138ce42d59ac..86d20702015fe9 100644
--- a/src/mono/cmake/configure.cmake
+++ b/src/mono/cmake/configure.cmake
@@ -16,8 +16,9 @@ function(ac_check_headers)
 	string(TOUPPER "${arg}" var1)
 	string(REPLACE "/" "_" var2 ${var1})
 	string(REPLACE "." "_" var3 ${var2})
+	string(REPLACE "-" "_" var4 ${var3})
 	if (FOUND_${arg})
-	  set(HAVE_${var3} 1 PARENT_SCOPE)
+	  set(HAVE_${var4} 1 PARENT_SCOPE)
 	endif()
   endforeach(arg)
 endfunction()