diff --git a/pkgs/epnix/tools/open62541_1_3/default.nix b/pkgs/epnix/tools/open62541_1_3/default.nix
index 6be7f217..34b78cb0 100644
--- a/pkgs/epnix/tools/open62541_1_3/default.nix
+++ b/pkgs/epnix/tools/open62541_1_3/default.nix
@@ -41,6 +41,8 @@ in
     };
 
     patches = [
+      # https://github.com/epics-modules/opcua/blob/b5db09477eb6404187199753df9e626d9a432210/devOpcuaSup/open62541/README.md#bugfix-for-shared-build
+      (./shared_build.patch)
       (fetchpatch {
         name = "Ensure-absolute-paths-in-pkg-config-file.patch";
         url = "https://github.com/open62541/open62541/commit/023d4b6b8bdec987f8f3ffee6c09801bbee4fa2d.patch";
diff --git a/pkgs/epnix/tools/open62541_1_3/shared_build.patch b/pkgs/epnix/tools/open62541_1_3/shared_build.patch
new file mode 100644
index 00000000..b8faa802
--- /dev/null
+++ b/pkgs/epnix/tools/open62541_1_3/shared_build.patch
@@ -0,0 +1,13 @@
+diff --git a/src/ua_types.c b/src/ua_types.c
+index b8f6739bb..7e8f7c43d 100644
+--- a/src/ua_types.c
++++ b/src/ua_types.c
+@@ -1880,7 +1880,7 @@ UA_Array_delete(void *p, size_t size, const UA_DataType *type) {
+ }
+ 
+ #ifdef UA_ENABLE_TYPEDESCRIPTION
+-UA_Boolean
++UA_Boolean UA_EXPORT
+ UA_DataType_getStructMember(const UA_DataType *type, const char *memberName,
+                             size_t *outOffset, const UA_DataType **outMemberType,
+                             UA_Boolean *outIsArray) {