diff --git a/driver/level3/level3_thread.c b/driver/level3/level3_thread.c
index 83403aef70..2657bbcfbe 100644
--- a/driver/level3/level3_thread.c
+++ b/driver/level3/level3_thread.c
@@ -48,6 +48,7 @@
 #endif
 
 #ifdef DYNAMIC_ARCH
+#undef GEMM_PREFERRED_SIZE
 #define GEMM_PREFERRED_SIZE gotoblas->preferred_size
 #endif
 #ifndef GEMM_PREFERRED_SIZE