diff --git a/nsprpub/pr/include/prtypes.h b/nsprpub/pr/include/prtypes.h
index 0925d01087ce..6850d6f9ac13 100644
--- a/nsprpub/pr/include/prtypes.h
+++ b/nsprpub/pr/include/prtypes.h
@@ -161,6 +161,22 @@
 #define PR_CALLBACK_DECL
 #define PR_STATIC_CALLBACK(__x) static __x
 
+#elif defined(XP_OS2) && defined(__declspec)
+
+#define PR_EXPORT(__type) extern __declspec(dllexport) __type
+#define PR_EXPORT_DATA(__type) extern __declspec(dllexport) __type
+#define PR_IMPORT(__type) extern  __declspec(dllimport) __type
+#define PR_IMPORT_DATA(__type) extern __declspec(dllimport) __type
+
+#define PR_EXTERN(__type) extern __declspec(dllexport) __type
+#define PR_IMPLEMENT(__type) __declspec(dllexport) __type
+#define PR_EXTERN_DATA(__type) extern __declspec(dllexport) __type
+#define PR_IMPLEMENT_DATA(__type) __declspec(dllexport) __type
+
+#define PR_CALLBACK
+#define PR_CALLBACK_DECL
+#define PR_STATIC_CALLBACK(__x) static __x
+
 #elif defined(XP_OS2_VACPP) 
 
 #define PR_EXPORT(__type) extern __type