diff --git a/ggml.c b/ggml.c
index e850fe777..4a4a9d51c 100644
--- a/ggml.c
+++ b/ggml.c
@@ -8468,7 +8468,7 @@ static void ggml_compute_forward_concat_f32(
     GGML_ASSERT(nb10 == sizeof(float));
 
     for (int i3 = 0; i3 < ne3; i3++) {
-        for (int i2 = ith; i2 < ne2; i2++) {
+        for (int i2 = ith; i2 < ne2; i2 += nth) {
             if (i2 < ne02) { // src0
                 for (int i1 = 0; i1 < ne1; i1++) {
                     for (int i0 = 0; i0 < ne0; i0++) {