diff --git a/extra/mmapeak/mmapeak.py b/extra/mmapeak/mmapeak.py
index 37b70c8c6e..05ee3010a7 100644
--- a/extra/mmapeak/mmapeak.py
+++ b/extra/mmapeak/mmapeak.py
@@ -48,7 +48,7 @@ if __name__=="__main__":
   COMPILER = HIPCompiler(DEV.arch)
   if DEV.arch in {'gfx1100', 'gfx1103', 'gfx1151'}:
     if DEV.arch == 'gfx1103': NUM_WORKGROUPS = 8
-    if DEV.arch == 'gfx1151': NUM_WORKGROUPS = 40
+    if DEV.arch == 'gfx1151': NUM_WORKGROUPS = 32
     launchBenchmark("v_wmma_bf16_16x16x16_bf16", (7,8,15))
     launchBenchmark("v_wmma_f16_16x16x16_f16", (7,8,15))
     launchBenchmark("v_wmma_f32_16x16x16_bf16", (7,8,15))