diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5a6cad0280..f5bcf2a76b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -937,7 +937,7 @@ endif()
 set(SDL_DISABLE_ALLOCA 0)
 check_include_file("alloca.h" "HAVE_ALLOCA_H")
 if(MSVC)
-  check_include_file("malloc.h" "HAVE_MALLOC")
+  check_include_file("malloc.h" "HAVE_MALLOC_H")
   check_symbol_exists("_alloca" "malloc.h" _ALLOCA_IN_MALLOC_H)
   if(NOT HAVE_ALLOCA_H AND NOT _ALLOCA_IN_MALLOC_H)
     set(SDL_DISABLE_ALLOCA 1)