diff --git a/src/if_perl.xs b/src/if_perl.xs
index 3b0fead..3d683bd 100644
--- a/src/if_perl.xs
+++ b/src/if_perl.xs
@@ -175,11 +175,13 @@
 #  define load_dll(n) dlopen((n), RTLD_LAZY|RTLD_GLOBAL)
 #  define symbol_from_dll dlsym
 #  define close_dll dlclose
+#  define load_dll_error dlerror
 # else
 #  define PERL_PROC FARPROC
 #  define load_dll vimLoadLib
 #  define symbol_from_dll GetProcAddress
 #  define close_dll FreeLibrary
+#  define load_dll_error GetWin32Error
 # endif
 /*
  * Wrapper defines