diff --git a/ext/pgsql/php_pgsql.h b/ext/pgsql/php_pgsql.h
index d58fe09ad2e..4d0bfd749b8 100644
--- a/ext/pgsql/php_pgsql.h
+++ b/ext/pgsql/php_pgsql.h
@@ -36,6 +36,12 @@ extern zend_module_entry pgsql_module_entry;
 #ifdef PHP_WIN32
 #define INV_WRITE            0x00020000
 #define INV_READ             0x00040000
+#undef PHPAPI
+#ifdef PGSQL_EXPORTS
+#define PHPAPI __declspec(dllexport)
+#else
+#define PHPAPI __declspec(dllimport)
+#endif
 #else
 #include <libpq/libpq-fs.h>
 #endif