diff --git a/include/json/config.h b/include/json/config.h
index 6359273a2..224d9ec28 100644
--- a/include/json/config.h
+++ b/include/json/config.h
@@ -35,6 +35,8 @@
 #if defined(_MSC_VER) || defined(__MINGW32__)
 #define JSON_API __declspec(dllexport)
 #define JSONCPP_DISABLE_DLL_INTERFACE_WARNING
+#elif defined(__OS2__)
+#define JSON_API __declspec(dllexport)
 #elif defined(__GNUC__) || defined(__clang__)
 #define JSON_API __attribute__((visibility("default")))
 #endif // if defined(_MSC_VER)
diff --git a/src/lib_json/CMakeLists.txt b/src/lib_json/CMakeLists.txt
index b7596e80b..8b93f1dc6 100644
--- a/src/lib_json/CMakeLists.txt
+++ b/src/lib_json/CMakeLists.txt
@@ -122,6 +122,11 @@ if(BUILD_SHARED_LIBS)
         POSITION_INDEPENDENT_CODE ${BUILD_SHARED_LIBS}
     )
 
+    if(OS2)
+        set_target_properties(${SHARED_LIB} PROPERTIES
+            OS2_DEF_VENDOR "$ENV{VENDOR}"
+            OS2_DEF_PATCH "${PROJECT_VERSION_PATCH}")
+    endif()
     # Set library's runtime search path on OSX
     if(APPLE)
         set_target_properties(${SHARED_LIB} PROPERTIES INSTALL_RPATH "@loader_path/.")