diff --git a/mace/kernels/addn.h b/mace/kernels/addn.h
index 0803bc2a08b1746174e79271e769b3e0ed32ee96..7538b5b1681e05cdd507277915e9b746461b7d4a 100644
--- a/mace/kernels/addn.h
+++ b/mace/kernels/addn.h
@@ -19,7 +19,7 @@
 namespace mace {
 namespace kernels {
 
-static constexpr int kCostPerGroup = 1024;
+constexpr int kCostPerGroup = 1024;
 
 template <DeviceType D, typename T>
 struct AddNFunctor {
diff --git a/mace/kernels/proposal.h b/mace/kernels/proposal.h
index d817ae137b9a91498baa68fe0eeac190794e3ca5..0f259cdc3db0e0addcc9ab67540f4d8781eacc97 100644
--- a/mace/kernels/proposal.h
+++ b/mace/kernels/proposal.h
@@ -15,7 +15,7 @@
 namespace mace {
 namespace kernels {
 
-static inline std::vector<float> WHCenters(const std::vector<float> &anchor) {
+inline std::vector<float> WHCenters(const std::vector<float> &anchor) {
   // width, height, width_center, height_center
   std::vector<float> window(4);
   window[0] = anchor[2] - anchor[0] + 1;
@@ -25,7 +25,7 @@ static inline std::vector<float> WHCenters(const std::vector<float> &anchor) {
   return window;
 }
 
-static inline std::vector<std::vector<float>> GenerateAnchors(
+inline std::vector<std::vector<float>> GenerateAnchors(
     const std::vector<int> &scales,
     const std::vector<float> &ratios,
     const int base_size) {
@@ -65,10 +65,10 @@ static inline std::vector<std::vector<float>> GenerateAnchors(
   return anchors;
 }
 
-static inline std::vector<int> nms(const float *bboxes_ptr,
-                                   const index_t num_bboxes,
-                                   const float thresh,
-                                   const int post_nms_top_n) {
+inline std::vector<int> nms(const float *bboxes_ptr,
+                            const index_t num_bboxes,
+                            const float thresh,
+                            const int post_nms_top_n) {
   std::vector<int> keep;
   std::vector<int> suppressed(num_bboxes, 0);
 
diff --git a/mace/kernels/resize_bilinear.h b/mace/kernels/resize_bilinear.h
index 7af3b39cdb8c3879e12a9517d85493de2aad65d8..5a513753771b9a3153d539a2f49ed819540c7bdc 100644
--- a/mace/kernels/resize_bilinear.h
+++ b/mace/kernels/resize_bilinear.h
@@ -23,15 +23,15 @@ struct CachedInterpolation {
   float lerp;
 };
 
-static inline float CalculateResizeScale(index_t in_size,
-                                         index_t out_size,
-                                         bool align_corners) {
+inline float CalculateResizeScale(index_t in_size,
+                                  index_t out_size,
+                                  bool align_corners) {
   return (align_corners && out_size > 1)
              ? (in_size - 1) / static_cast<float>(out_size - 1)
              : in_size / static_cast<float>(out_size);
 }
 
-static inline void ComputeInterpolationWeights(
+inline void ComputeInterpolationWeights(
     const index_t out_size,
     const index_t in_size,
     const float scale,
@@ -46,12 +46,12 @@ static inline void ComputeInterpolationWeights(
   }
 }
 
-static inline float ComputeLerp(const float top_left,
-                                const float top_right,
-                                const float bottom_left,
-                                const float bottom_right,
-                                const float x_lerp,
-                                const float y_lerp) {
+inline float ComputeLerp(const float top_left,
+                         const float top_right,
+                         const float bottom_left,
+                         const float bottom_right,
+                         const float x_lerp,
+                         const float y_lerp) {
   const float top = top_left + (top_right - top_left) * x_lerp;
   const float bottom = bottom_left + (bottom_right - bottom_left) * x_lerp;
   return top + (bottom - top) * y_lerp;