diff --git a/tests/checkasm/vf_gblur.c b/tests/checkasm/vf_gblur.c
index 1d63fc22a0..8ff47a338f 100644
--- a/tests/checkasm/vf_gblur.c
+++ b/tests/checkasm/vf_gblur.c
@@ -33,32 +33,34 @@
             tmp_buf[j] = (float)(rnd() & 0xFF); \
     } while (0)
 
+static void check_horiz_slice(float *dst_ref, float *dst_new)
+{
+    int steps = 2;
+    float nu = 0.101f;
+    float bscale = 1.112f;
+
+    declare_func(void, float *dst, int w, int h, int steps, float nu, float bscale);
+    call_ref(dst_ref, WIDTH, HEIGHT, steps, nu, bscale);
+    call_new(dst_new, WIDTH, HEIGHT, steps, nu, bscale);
+    if (!float_near_abs_eps_array(dst_ref, dst_new, 0.01f, PIXELS)) {
+         fail();
+    }
+    bench_new(dst_new, WIDTH, HEIGHT, 1, nu, bscale);
+}
+
 void checkasm_check_vf_gblur(void)
 {
     float *dst_ref = av_malloc(BUF_SIZE);
     float *dst_new = av_malloc(BUF_SIZE);
-    int w = WIDTH;
-    int h = HEIGHT;
-    int steps = 2;
-    float nu = 0.101f;
-    float bscale = 1.112f;
     GBlurContext s;
 
-    declare_func(void, float *dst, int w, int h, int steps, float nu, float bscale);
-
     randomize_buffers(dst_ref, PIXELS);
     memcpy(dst_new, dst_ref, BUF_SIZE);
 
     ff_gblur_init(&s);
 
     if (check_func(s.horiz_slice, "horiz_slice")) {
-        call_ref(dst_ref, w, h, steps, nu, bscale);
-        call_new(dst_new, w, h, steps, nu, bscale);
-
-        if (!float_near_abs_eps_array(dst_ref, dst_new, 0.01f, PIXELS)) {
-            fail();
-        }
-        bench_new(dst_new, w, h, 1, nu, bscale);
+        check_horiz_slice(dst_ref, dst_new);
     }
     report("horiz_slice");
     av_freep(&dst_ref);