diff --git a/src/format_mp3.c b/src/format_mp3.c
index 7ff0f4eff4a3f0222a6a3800d5153f630b676fbc..c4bb7d8be9947a07e076f5da415cc4f657e36fd0 100644
--- a/src/format_mp3.c
+++ b/src/format_mp3.c
@@ -25,6 +25,7 @@
 #ifdef WIN32
 #define strcasecmp stricmp
 #define strncasecmp strnicmp
+#define alloca _alloca
 #endif
 
 #define CATMODULE "format-mp3"
@@ -53,10 +54,6 @@ typedef struct {
    int metadata_offset;
 } mp3_client_data;
 
-#ifdef WIN32
-#define alloca _alloca
-#endif
-
 format_plugin_t *format_mp3_get_plugin(http_parser_t *parser)
 {
     char *metadata;