diff --git a/cmake/external_mkldnn_v1.cmake b/cmake/external_mkldnn_v1.cmake
index fb77250c..d72d1b6c 100644
--- a/cmake/external_mkldnn_v1.cmake
+++ b/cmake/external_mkldnn_v1.cmake
@@ -200,6 +200,7 @@ if (WIN32)
         CONFIGURE_COMMAND
         PATCH_COMMAND ${MKLDNN_PATCH_REVERT_COMMAND}
         COMMAND git apply --ignore-space-change --ignore-whitespace ${CMAKE_SOURCE_DIR}/cmake/${MKLDNN_PATCH_FILE}
+        COMMAND git apply --ignore-space-change --ignore-whitespace ${CMAKE_SOURCE_DIR}/cmake/mkldnn_constexpr.patch
         CMAKE_GENERATOR ${CMAKE_GENERATOR}
         CMAKE_GENERATOR_PLATFORM ${CMAKE_GENERATOR_PLATFORM}
         CMAKE_GENERATOR_TOOLSET ${CMAKE_GENERATOR_TOOLSET}
diff --git a/cmake/mkldnn_constexpr.patch b/cmake/mkldnn_constexpr.patch
new file mode 100644
index 00000000..86e99cc8
--- /dev/null
+++ b/cmake/mkldnn_constexpr.patch
@@ -0,0 +1,43 @@
+diff --git a/src/cpu/rnn/rnn_reorders.hpp b/src/cpu/rnn/rnn_reorders.hpp
+index fbfedd01..786d4f8f 100644
+--- a/src/cpu/rnn/rnn_reorders.hpp
++++ b/src/cpu/rnn/rnn_reorders.hpp
+@@ -128,7 +128,7 @@ struct rnn_weights_reorder_t : public cpu_primitive_t {
+             return status::success;
+         }
+ 
+-        format_tag_t itag_;
++        format_tag_t itag_ = mkldnn_format_tag_undef;
+ 
+     private:
+         void init_scratchpad() {
+diff --git a/src/cpu/simple_concat.hpp b/src/cpu/simple_concat.hpp
+index fe84eb14..f1b2bd17 100644
+--- a/src/cpu/simple_concat.hpp
++++ b/src/cpu/simple_concat.hpp
+@@ -98,9 +98,9 @@ struct simple_concat_t: public cpu_primitive_t {
+             return status::success;
+         }
+ 
+-        int perm_[MKLDNN_MAX_NDIMS];
+-        int iperm_[MKLDNN_MAX_NDIMS];
+-        dims_t blocks_;
++        int perm_[MKLDNN_MAX_NDIMS] {};
++        int iperm_[MKLDNN_MAX_NDIMS] {};
++        dims_t blocks_ {};
+ 
+         dim_t nelems_to_concat(const memory_desc_wrapper &data_d) const {
+             const int ndims = data_d.ndims();
+diff --git a/src/cpu/simple_sum.hpp b/src/cpu/simple_sum.hpp
+index 46a24810..c5376eab 100644
+--- a/src/cpu/simple_sum.hpp
++++ b/src/cpu/simple_sum.hpp
+@@ -71,7 +71,7 @@ struct simple_sum_t: public cpu_primitive_t {
+         }
+ 
+         sum_bf16_params_t bf16_p_;
+-        dim_t block_size_, nelems_, blocks_number_, tail_;
++        dim_t block_size_ = 0, nelems_ = 0, blocks_number_ = 0, tail_ = 0;
+ 
+     private:
+         const dim_t cacheline_size_ = 64; // bytes