diff --git a/Python/import.c b/Python/import.c
index 7099d1b92b4..5c8d9399794 100644
--- a/Python/import.c
+++ b/Python/import.c
@@ -1055,27 +1055,44 @@ check_case(char *buf, int len, int namelen, char *name)
 
 #ifdef macintosh
 #include <TextUtils.h>
+#ifdef USE_GUSI
+#include "TFileSpec.h"		/* for Path2FSSpec() */
+#endif
 static int
 check_case(char *buf, int len, int namelen, char *name)
 {
 	FSSpec fss;
 	OSErr err;
-	unsigned char mybuf[MAXPATHLEN+1];
-	
-	strcpy((char *)mybuf, buf);
-	c2pstr((char *)mybuf);
-	err = FSMakeFSSpec(0, 0, mybuf, &fss);
+#ifndef USE_GUSI
+	err = FSMakeFSSpec(0, 0, Pstring(buf), &fss);
+#else
+	/* GUSI's Path2FSSpec() resolves all possible aliases nicely on
+	   the way, which is fine for all directories, but here we need
+	   the original name of the alias file (say, Dlg.ppc.slb, not
+	   toolboxmodules.ppc.slb). */
+	char *colon;
+	err = Path2FSSpec(buf, &fss);
+	if (err == noErr) {
+		colon = strrchr(buf, ':'); /* find filename */
+		if (colon != NULL)
+			err = FSMakeFSSpec(fss.vRefNum, fss.parID,
+					   Pstring(colon+1), &fss);
+		else
+			err = FSMakeFSSpec(fss.vRefNum, fss.parID,
+					   fss.name, &fss);
+	}
+#endif
 	if (err) {
 		PyErr_Format(PyExc_NameError,
-		  "Can't find file for module %.100s\n(filename %.300s)",
-		  name, buf);
+		     "Can't find file for module %.100s\n(filename %.300s)",
+		     name, buf);
 		return 0;
 	}
 	p2cstr(fss.name);
 	if ( strncmp(name, (char *)fss.name, namelen) != 0 ) {
 		PyErr_Format(PyExc_NameError,
-		  "Case mismatch for module name %.100s\n(filename %.300s)",
-		  name, fss.name);
+		     "Case mismatch for module name %.100s\n(filename %.300s)",
+		     name, fss.name);
 		return 0;
 	}
 	return 1;
diff --git a/Python/importdl.c b/Python/importdl.c
index ef015ad2ecd..774b7b37a76 100644
--- a/Python/importdl.c
+++ b/Python/importdl.c
@@ -249,6 +249,9 @@ typedef void (*dl_funcptr)();
 #define CFragConnectionID ConnectionID
 #define kLoadCFrag 0x01
 #endif
+#ifdef USE_GUSI
+#include "TFileSpec.h"		/* for Path2FSSpec() */
+#endif
 #include <Files.h>
 #include "macdefs.h"
 #include "macglue.h"
@@ -372,15 +375,21 @@ _PyImport_LoadDynamicModule(name, pathname, fp)
 		Ptr mainAddr;
 		Str255 errMessage;
 		OSErr err;
+#ifndef USE_GUSI
 		Boolean isfolder, didsomething;
+#endif
 		char buf[512];
 		Str63 fragname;
 		Ptr symAddr;
 		CFragSymbolClass class;
 		
 		/* First resolve any aliases to find the real file */
+#ifdef USE_GUSI
+		err = Path2FSSpec(pathname, &libspec);
+#else
 		(void)FSMakeFSSpec(0, 0, Pstring(pathname), &libspec);
 		err = ResolveAliasFile(&libspec, 1, &isfolder, &didsomething);
+#endif
 		if ( err ) {
 			sprintf(buf, "%.255s: %.200s",
 				pathname, PyMac_StrError(err));