diff --git a/CMakeLists.txt b/CMakeLists.txt
index 621382177..bdc89d9b9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -343,7 +343,7 @@ check_symbol_exists( ffs       "string.h" HAVE_FFS_PROTO )
 check_symbol_exists( asprintf  "stdio.h"  HAVE_ASPRINTF_PROTO )
 check_symbol_exists( vasprintf "stdio.h"  HAVE_VASPRINTF_PROTO )
 check_symbol_exists( snprintf  "stdio.h"  HAVE_SNPRINTF_PROTO )
-check_symbol_exists( vsnprintf "stdarg.h" HAVE_VSNPRINTF_PROTO )
+check_symbol_exists( vsnprintf "stdarg.h;stdio.h" HAVE_VSNPRINTF_PROTO )
 check_symbol_exists( strvercmp "string.h" HAVE_STRVERCMP_PROTO )