diff --git a/include/pss/definitions.h b/include/pss/definitions.h
index fdaae85..b54eef2 100644
--- a/include/pss/definitions.h
+++ b/include/pss/definitions.h
@@ -6,9 +6,21 @@
 #endif
 
 #if defined(__unix) || defined(__unix__)
-# ifdef PSS_DLL_MODE
+
+#define PSS_DECLSPEC
+
 #elif defined(_WIN32) || defined(__WIN32__)
 
+# ifdef PSS_DLL_MODE
+#  ifdef PSS_BUILDING_DLL
+#   define PSS_DECLSPEC __declspec(dllexport)
+#  else
+#   define PSS_DECLSPEC __declspec(dllimport)
+#  endif
+# else
+#  define PSS_DECLSPEC
+# endif
+
 #else
 # error Unknow platform!
 #endif