diff --git a/samples/nehe06_vq/main.c b/samples/nehe06_vq/main.c
index 7add337..408d8e0 100644
--- a/samples/nehe06_vq/main.c
+++ b/samples/nehe06_vq/main.c
@@ -45,7 +45,7 @@ int ImageLoad(char *filename, Image *image) {
 
     fread(&header, sizeof(header), 1, file);
 
-    GLboolean twiddled = (header.type & (1 << 26)) > 0;
+    GLboolean twiddled = (header.type & (1 << 26)) < 1;
     GLboolean compressed = (header.type & (1 << 30)) > 0;
     GLboolean mipmapped = (header.type & (1 << 31)) > 0;
     GLboolean strided = (header.type & (1 << 25)) > 0;