diff --git a/dlls/shlwapi/tests/url.c b/dlls/shlwapi/tests/url.c
index 29d0cffd00a..949aaa00799 100644
--- a/dlls/shlwapi/tests/url.c
+++ b/dlls/shlwapi/tests/url.c
@@ -343,7 +343,7 @@ static const TEST_URL_COMBINE TEST_COMBINE[] = {
     {"foo:today", "foo:calendar", 0, S_OK, "foo:calendar"},
     {"foo:today", "bar:calendar", 0, S_OK, "bar:calendar"},
     {"foo:/today", "foo:calendar", 0, S_OK, "foo:/calendar"},
-    {"foo:/today/", "foo:calendar", 0, S_OK, "foo:/today/calendar"},
+    {"Foo:/today/", "fOo:calendar", 0, S_OK, "foo:/today/calendar"},
     {"mk:@MSITStore:dir/test.chm::dir/index.html", "image.jpg", 0, S_OK, "mk:@MSITStore:dir/test.chm::dir/image.jpg"},
     {"mk:@MSITStore:dir/test.chm::dir/dir2/index.html", "../image.jpg", 0, S_OK, "mk:@MSITStore:dir/test.chm::dir/image.jpg"},
     /* UrlCombine case 2 tests.  Schemes do not match */
@@ -365,7 +365,7 @@ static const TEST_URL_COMBINE TEST_COMBINE[] = {
     {"outbind://xxxxxxxxx/","http:wine16/dir",0, S_OK,"http:wine16/dir"},
     {"http://xxxxxxxxx","outbind:wine17/dir",URL_PLUGGABLE_PROTOCOL, S_OK,"outbind:wine17/dir"},
     {"xxx://xxxxxxxxx","ftp:wine18/dir",URL_PLUGGABLE_PROTOCOL, S_OK,"ftp:wine18/dir"},
-    {"ftp://xxxxxxxxx/","xxx:wine19/dir",URL_PLUGGABLE_PROTOCOL, S_OK,"xxx:wine19/dir"},
+    {"ftp://xxxxxxxxx/","xXx:wine19/dir",URL_PLUGGABLE_PROTOCOL, S_OK,"xxx:wine19/dir"},
     {"outbind://xxxxxxxxx/","http:wine20/dir",URL_PLUGGABLE_PROTOCOL, S_OK,"http:wine20/dir"},
     {"file:///c:/dir/file.txt","index.html?test=c:/abc",URL_ESCAPE_SPACES_ONLY|URL_DONT_ESCAPE_EXTRA_INFO,S_OK,"file:///c:/dir/index.html?test=c:/abc"}
 };
diff --git a/dlls/shlwapi/url.c b/dlls/shlwapi/url.c
index d43bea5a791..54b1b1047ff 100644
--- a/dlls/shlwapi/url.c
+++ b/dlls/shlwapi/url.c
@@ -662,7 +662,7 @@ HRESULT WINAPI UrlCombineW(LPCWSTR pszBase, LPCWSTR pszRelative,
 {
     PARSEDURLW base, relative;
     DWORD myflags, sizeloc = 0;
-    DWORD len, res1, res2, process_case = 0;
+    DWORD i, len, res1, res2, process_case = 0;
     LPWSTR work, preliminary, mbase, mrelative;
     static const WCHAR myfilestr[] = {'f','i','l','e',':','/','/','/','\0'};
     HRESULT ret;
@@ -703,6 +703,10 @@ HRESULT WINAPI UrlCombineW(LPCWSTR pszBase, LPCWSTR pszRelative,
     else do {
         BOOL manual_search = FALSE;
 
+        work = (LPWSTR)base.pszProtocol;
+        for(i=0; i<base.cchProtocol; i++)
+            work[i] = tolowerW(work[i]);
+
         /* mk is a special case */
         if(base.nScheme == URL_SCHEME_MK) {
             static const WCHAR wsz[] = {':',':',0};
@@ -826,7 +830,11 @@ HRESULT WINAPI UrlCombineW(LPCWSTR pszBase, LPCWSTR pszRelative,
             }
             process_case = (*base.pszSuffix == '/' || base.nScheme == URL_SCHEME_MK) ? 5 : 3;
 	    break;
-	}
+	}else {
+            work = (LPWSTR)relative.pszProtocol;
+            for(i=0; i<relative.cchProtocol; i++)
+                work[i] = tolowerW(work[i]);
+        }
 
 	/* handle cases where pszRelative has scheme */
 	if ((base.cchProtocol == relative.cchProtocol) &&