diff --git a/src/mesa/pipe/draw/draw_vertex_fetch.c b/src/mesa/pipe/draw/draw_vertex_fetch.c
index 0789dc8e8c7..af3983b7f03 100644
--- a/src/mesa/pipe/draw/draw_vertex_fetch.c
+++ b/src/mesa/pipe/draw/draw_vertex_fetch.c
@@ -62,7 +62,7 @@ fetch_##NAME(const void *ptr, float *attrib)		\
    }							\
 }
 
-#define CVT_64_FLOAT   ((double *) ptr)[i]
+#define CVT_64_FLOAT   (float) ((double *) ptr)[i]
 #define CVT_32_FLOAT   ((float *) ptr)[i]
 
 #define CVT_8_USCALED  (float) ((unsigned char *) ptr)[i]