diff --git a/src/gallium/auxiliary/tgsi/tgsi_exec.c b/src/gallium/auxiliary/tgsi/tgsi_exec.c
index f7ed64121f0..e2ed18d6049 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_exec.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_exec.c
@@ -1461,7 +1461,7 @@ fetch_src_file_channel(const struct tgsi_exec_machine *mach,
             const uint constbuf = index2D->i[i];
             const int pos = index->i[i] * 4 + swizzle;
             /* const buffer bounds check */
-            if (pos < 0 || pos >= (int) mach->ConstsSize[constbuf]) {
+            if (pos < 0 || pos >= (int) mach->ConstsSize[constbuf] / 4) {
                if (0) {
                   /* Debug: print warning */
                   static int count = 0;