diff --git a/src/luaapi.c b/src/luaapi.c
index dae0c5c..f28042e 100644
--- a/src/luaapi.c
+++ b/src/luaapi.c
@@ -3043,12 +3043,19 @@ static int parse_glsl_table(struct k3Mat *mat) {
 		}
 		lua_pop(L, 1);
 		
-		char prefix[272];
+		char prefix[512];
 		
-		snprintf(prefix, sizeof(prefix), "#version %lu\n%s", vsVer, defs);
+		const char *prefixfmt;
+		if(k3IsSoftSkinning) {
+			prefixfmt = "#version %lu\n%s";
+		} else {
+			prefixfmt = "#version %lu\n#define k3_GPU_SKINNING\n%s";
+		}
+		
+		snprintf(prefix, sizeof(prefix), prefixfmt, vsVer, defs);
 		char *vsSrc = read_full_file(prefix, "assets/mdl/", vsFile, "");
 		
-		snprintf(prefix, sizeof(prefix), "#version %lu\n%s", fsVer, defs);
+		snprintf(prefix, sizeof(prefix), prefixfmt, fsVer, defs);
 		char *fsSrc = read_full_file(prefix, "assets/mdl/", fsFile, "");
 		
 		k3Log(k3_INFO, "Attempting to compile \"%s\" & \"%s\"...", vsFile, fsFile);