diff --git a/src/stdlib/SDL_string.c b/src/stdlib/SDL_string.c
index 0eb40331a..5c1f351d6 100644
--- a/src/stdlib/SDL_string.c
+++ b/src/stdlib/SDL_string.c
@@ -72,7 +72,7 @@ static size_t SDL_ScanLong(const char *text, int radix, long *valuep)
 }
 #endif
 
-#ifndef HAVE_SSCANF
+#if !defined(HAVE_SSCANF) || !defined(HAVE_STRTOD)
 static size_t SDL_ScanUnsignedLong(const char *text, int radix, unsigned long *valuep)
 {
     const char *textstart = text;