diff --git a/simgear/nasal/lib.c b/simgear/nasal/lib.c
index f9768d52..7597742c 100644
--- a/simgear/nasal/lib.c
+++ b/simgear/nasal/lib.c
@@ -1,14 +1,14 @@
 #include "nasal.h"
 
-#ifndef _MSC_VER
 // No need to include <string.h> just for this:
-static int strlen(char* s)
+// It needs a funny name because MSVC wants to treat "strlen" as a
+// special symbol.  Ugh...
+static int StrLen(char* s)
 {
     char* s0 = s;
     while(*s) s++;
     return s - s0;
 }
-#endif
 
 static naRef size(naContext c, naRef args)
 {
@@ -146,7 +146,7 @@ static naRef typeOf(naContext c, naRef args)
     else if(naIsHash(r)) t = "hash";
     else if(naIsFunc(r)) t = "func";
     else if(naIsGhost(r)) t = "ghost";
-    r = naStr_fromdata(naNewString(c), t, strlen(t));
+    r = naStr_fromdata(naNewString(c), t, StrLen(t));
     return r;
 }
 
@@ -174,7 +174,7 @@ naRef naStdLib(naContext c)
     for(i=0; i<n; i++) {
         naRef code = naNewCCode(c, funcs[i].func);
         naRef name = naStr_fromdata(naNewString(c),
-                                    funcs[i].name, strlen(funcs[i].name));
+                                    funcs[i].name, StrLen(funcs[i].name));
         naHash_set(namespace, name, naNewFunc(c, code));
     }
     return namespace;