diff --git a/dnn/src/arm_common/conv_bias/int8/direct_kernels/dot_direct_nchw_large.h b/dnn/src/arm_common/conv_bias/int8/direct_kernels/dot_direct_nchw_large.h
index c689ae74..fc90ebee 100644
--- a/dnn/src/arm_common/conv_bias/int8/direct_kernels/dot_direct_nchw_large.h
+++ b/dnn/src/arm_common/conv_bias/int8/direct_kernels/dot_direct_nchw_large.h
@@ -1,4 +1,5 @@
 #pragma once
+#include <cstddef>
 #include "megdnn/arch.h"
 #if MGB_ENABLE_DOT
 
@@ -21,4 +22,4 @@ void megdnn_dot_nchw_large_chanwise_direct_conv_11x11s2_oh4_ow16(
         const int8_t* src, const int8_t* weight, int32_t bias, int8_t* dst, size_t oh,
         size_t ow, size_t OH, size_t OW, size_t pad_iw, const float scale,
         int8_t relu_val);
-#endif
\ No newline at end of file
+#endif
diff --git a/src/core/include/megbrain/common.h b/src/core/include/megbrain/common.h
index e76fd81b..033a6a6c 100644
--- a/src/core/include/megbrain/common.h
+++ b/src/core/include/megbrain/common.h
@@ -9,6 +9,7 @@
 #include <mutex>
 #include <string>
 
+#include <cerrno>
 #include <cstdarg>
 #include <cstddef>
 #include <cstdint>