diff --git a/src/k3mix.c b/src/k3mix.c
index 2c260bc..84b7cf2 100644
--- a/src/k3mix.c
+++ b/src/k3mix.c
@@ -1,6 +1,5 @@
 #include"k3mix.h"
 
-#define _GNU_SOURCE
 #include<vorbis/vorbisfile.h>
 #include<string.h>
 #include<stdlib.h>
@@ -9,6 +8,10 @@
 #include<assert.h>
 #include"k3.h"
 
+#ifdef _WIN32
+#define strncasecmp _strnicmp
+#endif
+
 static uint32_t FinalSampleRate;
 static uint8_t FinalChannels;
 
@@ -31,7 +34,7 @@ struct k3MixSource *k3MixSourceFile(const char *path) {
 	
 	ret->looppoint = 0;
 	for(size_t ci = 0; ci < ret->vf.vc->comments; ci++) {
-		if(strcasestr(ret->vf.vc->user_comments[ci], "looppoint=") == ret->vf.vc->user_comments[ci]) {
+		if(strncasecmp(ret->vf.vc->user_comments[ci], "looppoint=", 10) == 0) {
 			ret->looppoint = strtol(ret->vf.vc->user_comments[ci] + 10, NULL, 0);
 			k3Log(k3_DEBUG, "%s has loop point %lu", path, ret->looppoint);
 		}