diff --git a/gcc/ada/ChangeLog b/gcc/ada/ChangeLog
index 968ec55e1a66..fd56ece2503a 100644
--- a/gcc/ada/ChangeLog
+++ b/gcc/ada/ChangeLog
@@ -1,3 +1,7 @@
+2009-04-29  Pascal Obry  <obry@adacore.com>
+
+	* initialize.c: Do not expand quoted arguments.
+
 2009-04-29  Emmanuel Briot  <briot@adacore.com>
 
 	* prj-ext.adb, prj.adb, prj.ads: Fix memory leaks.
diff --git a/gcc/ada/initialize.c b/gcc/ada/initialize.c
index 8ad15bd8e91c..705cbf20e3cc 100644
--- a/gcc/ada/initialize.c
+++ b/gcc/ada/initialize.c
@@ -130,6 +130,7 @@ __gnat_initialize (void *eh ATTRIBUTE_UNUSED)
      int last;
      int argc_expanded = 0;
      TCHAR result [MAX_PATH];
+     int quoted;
 
      wargv = CommandLineToArgvW (GetCommandLineW(), &wargc);
 
@@ -146,9 +147,12 @@ __gnat_initialize (void *eh ATTRIBUTE_UNUSED)
 
 	 for (k=1; k<wargc; k++)
 	   {
-	     /* Check for wildcard expansion. */
-	     if (_tcsstr (wargv[k], _T("?")) != 0 ||
-		 _tcsstr (wargv[k], _T("*")) != 0)
+	     quoted = (wargv[k][0] == _T('\''));
+
+	     /* Check for wildcard expansion if the argument is not quoted. */
+	     if (!quoted
+		 && (_tcsstr (wargv[k], _T("?")) != 0 ||
+		     _tcsstr (wargv[k], _T("*")) != 0))
 	       {
 		 /* Wilcards are present, append all corresponding matches. */
 		 WIN32_FIND_DATA FileData;
@@ -173,8 +177,19 @@ __gnat_initialize (void *eh ATTRIBUTE_UNUSED)
 	       }
 	     else
 	       {
-		 /*  No wildcard. Store parameter as-is. */
-		 append_arg (&argc_expanded, wargv[k], &gnat_argv, &last);
+		 /*  No wildcard. Store parameter as-is. Remove quote if
+		     needed. */
+		 if (quoted)
+		   {
+		     int len = _tcslen (wargv[k]);
+
+		     /* Remove ending quote */
+		     wargv[k][len-1] = _T('\0');
+		     append_arg
+		       (&argc_expanded, &wargv[k][1], &gnat_argv, &last);
+		   }
+		 else
+		   append_arg (&argc_expanded, wargv[k], &gnat_argv, &last);
 	       }
 	   }