diff --git a/engine/common/zone.c b/engine/common/zone.c
index 95200ce3c..0c0d93f2d 100644
--- a/engine/common/zone.c
+++ b/engine/common/zone.c
@@ -189,7 +189,14 @@ void *Z_MallocNamed(int size, char *file, int line)
 #else
 void *ZF_Malloc(int size)
 {
+#ifdef __linux__
+	void *ret = NULL;
+	if (!posix_memalign(&ret, max(sizeof(float)*4, sizeof(void*)), size))
+		memset(ret, 0, size);
+	return ret;
+#else
 	return calloc(size, 1);
+#endif
 }
 void *Z_Malloc(int size)
 {
@@ -437,7 +444,11 @@ void BZ_Free(void *data)
 
 typedef struct zonegroupblock_s
 {
-	struct zonegroupblock_s *next;
+	union
+	{
+		struct zonegroupblock_s *next;
+		vec4_t align16;
+	};
 } zonegroupblock_t;
 
 #ifdef USE_MSVCRT_DEBUG
diff --git a/engine/gl/gl_model.c b/engine/gl/gl_model.c
index 0ffde7256..c8351ebe7 100644
--- a/engine/gl/gl_model.c
+++ b/engine/gl/gl_model.c
@@ -2495,7 +2495,8 @@ static void Mod_Batches_BuildModelMeshes(model_t *mod, int maxverts, int maxindi
 
 	vbo.indicies.dummy = ZG_Malloc(&loadmodel->memgroup, sizeof(index_t) * maxindicies);
 	vbo.coord.dummy = ZG_Malloc(&loadmodel->memgroup, (sizeof(vecV_t)+sizeof(vec2_t)*(1+styles)+sizeof(vec3_t)*3+sizeof(vec4_t))* maxverts);
-	vbo.texcoord.dummy = (vecV_t*)vbo.coord.dummy + maxverts;
+	vbo.colours.dummy = (vecV_t*)vbo.coord.dummy + maxverts;
+	vbo.texcoord.dummy = (vec4_t*)vbo.colours.dummy + maxverts;
 	sty = 0;
 	if (styles)
 	{
@@ -2509,7 +2510,6 @@ static void Mod_Batches_BuildModelMeshes(model_t *mod, int maxverts, int maxindi
 	vbo.normals.dummy = styles?((vec2_t*)vbo.lmcoord[styles-1].dummy + maxverts):((vec2_t*)vbo.texcoord.dummy + maxverts);
 	vbo.svector.dummy = (vec3_t*)vbo.normals.dummy + maxverts;
 	vbo.tvector.dummy = (vec3_t*)vbo.svector.dummy + maxverts;
-	vbo.colours.dummy = (vec3_t*)vbo.tvector.dummy + maxverts;
 
 	numindicies = 0;
 	numverts = 0;