diff --git a/dlls/wininet/tests/urlcache.c b/dlls/wininet/tests/urlcache.c
index 162d38557fb..92bd2f02f2d 100644
--- a/dlls/wininet/tests/urlcache.c
+++ b/dlls/wininet/tests/urlcache.c
@@ -512,20 +512,16 @@ static void test_urlcacheA(void)
     ret = CommitUrlCacheEntry(TEST_URL, NULL, filetime_zero, filetime_zero,
             STICKY_CACHE_ENTRY, (LPBYTE)ok_header, strlen(ok_header), "html",
             NULL);
-    todo_wine {
     ok(!ret, "expected failure\n");
     ok(GetLastError() == ERROR_INVALID_PARAMETER,
        "expected ERROR_INVALID_PARAMETER, got %d\n", GetLastError());
-    }
     SetLastError(0xdeadbeef);
     ret = CommitUrlCacheEntry(TEST_URL, NULL, filetime_zero, filetime_zero,
             NORMAL_CACHE_ENTRY|STICKY_CACHE_ENTRY,
             (LPBYTE)ok_header, strlen(ok_header), "html", NULL);
-    todo_wine {
     ok(!ret, "expected failure\n");
     ok(GetLastError() == ERROR_INVALID_PARAMETER,
        "expected ERROR_INVALID_PARAMETER, got %d\n", GetLastError());
-    }
     ret = CreateUrlCacheEntry(TEST_URL, 0, "html", filenameA, 0);
     ok(ret, "CreateUrlCacheEntry failed with error %d\n", GetLastError());
     create_and_write_file(filenameA, &zero_byte, sizeof(zero_byte));
@@ -545,7 +541,6 @@ static void test_urlcacheA(void)
     ok(lpCacheEntryInfo->CacheEntryType & (NORMAL_CACHE_ENTRY|STICKY_CACHE_ENTRY),
        "expected cache entry type NORMAL_CACHE_ENTRY | STICKY_CACHE_ENTRY, got %d (0x%08x)\n",
        lpCacheEntryInfo->CacheEntryType, lpCacheEntryInfo->CacheEntryType);
-    todo_wine
     ok(lpCacheEntryInfo->dwExemptDelta == 86400,
        "expected dwExemptDelta 864000, got %d\n",
        lpCacheEntryInfo->dwExemptDelta);
@@ -578,7 +573,6 @@ static void test_urlcacheA(void)
     ok(lpCacheEntryInfo->CacheEntryType & (NORMAL_CACHE_ENTRY|STICKY_CACHE_ENTRY),
        "expected cache entry type NORMAL_CACHE_ENTRY | STICKY_CACHE_ENTRY, got %d (0x%08x)\n",
        lpCacheEntryInfo->CacheEntryType, lpCacheEntryInfo->CacheEntryType);
-    todo_wine
     ok(lpCacheEntryInfo->dwExemptDelta == 86400,
        "expected dwExemptDelta 864000, got %d\n",
        lpCacheEntryInfo->dwExemptDelta);
diff --git a/dlls/wininet/urlcache.c b/dlls/wininet/urlcache.c
index 137ec3c0fad..05e16a88104 100644
--- a/dlls/wininet/urlcache.c
+++ b/dlls/wininet/urlcache.c
@@ -2473,6 +2473,11 @@ static BOOL CommitUrlCacheEntryInternal(
         debugstr_w(lpszFileExtension),
         debugstr_w(lpszOriginalUrl));
 
+    if (CacheEntryType & STICKY_CACHE_ENTRY && !lpszLocalFileName)
+    {
+        SetLastError(ERROR_INVALID_PARAMETER);
+        return FALSE;
+    }
     if (lpszOriginalUrl)
         WARN(": lpszOriginalUrl ignored\n");
 
@@ -2612,7 +2617,13 @@ static BOOL CommitUrlCacheEntryInternal(
     pUrlEntry->CacheDir = cDirectory;
     pUrlEntry->CacheEntryType = CacheEntryType;
     pUrlEntry->dwHeaderInfoSize = dwHeaderSize;
-    pUrlEntry->dwExemptDelta = 0;
+    if (CacheEntryType & STICKY_CACHE_ENTRY)
+    {
+        /* Sticky entries have a default exempt time of one day */
+        pUrlEntry->dwExemptDelta = 86400;
+    }
+    else
+        pUrlEntry->dwExemptDelta = 0;
     pUrlEntry->dwHitRate = 0;
     pUrlEntry->dwOffsetFileExtension = dwOffsetFileExtension;
     pUrlEntry->dwOffsetHeaderInfo = dwOffsetHeader;
@@ -2653,8 +2664,12 @@ static BOOL CommitUrlCacheEntryInternal(
     {
         if (pUrlEntry->CacheDir < pHeader->DirectoryCount)
             pHeader->directory_data[pUrlEntry->CacheDir].dwNumFiles++;
-        pHeader->CacheUsage.QuadPart += file_size.QuadPart;
-        if (pHeader->CacheUsage.QuadPart > pHeader->CacheLimit.QuadPart)
+        if (CacheEntryType & STICKY_CACHE_ENTRY)
+            pHeader->ExemptUsage.QuadPart += file_size.QuadPart;
+        else
+            pHeader->CacheUsage.QuadPart += file_size.QuadPart;
+        if (pHeader->CacheUsage.QuadPart + pHeader->ExemptUsage.QuadPart >
+            pHeader->CacheLimit.QuadPart)
             FIXME("file of size %s bytes fills cache\n", wine_dbgstr_longlong(file_size.QuadPart));
     }
 
@@ -3032,10 +3047,20 @@ BOOL WINAPI DeleteUrlCacheEntryA(LPCSTR lpszUrlName)
         if (pHeader->directory_data[pUrlEntry->CacheDir].dwNumFiles)
             pHeader->directory_data[pUrlEntry->CacheDir].dwNumFiles--;
     }
-    if (pUrlEntry->size.QuadPart < pHeader->CacheUsage.QuadPart)
-        pHeader->CacheUsage.QuadPart -= pUrlEntry->size.QuadPart;
+    if (pUrlEntry->CacheEntryType & STICKY_CACHE_ENTRY)
+    {
+        if (pUrlEntry->size.QuadPart < pHeader->ExemptUsage.QuadPart)
+            pHeader->ExemptUsage.QuadPart -= pUrlEntry->size.QuadPart;
+        else
+            pHeader->ExemptUsage.QuadPart = 0;
+    }
     else
-        pHeader->CacheUsage.QuadPart = 0;
+    {
+        if (pUrlEntry->size.QuadPart < pHeader->CacheUsage.QuadPart)
+            pHeader->CacheUsage.QuadPart -= pUrlEntry->size.QuadPart;
+        else
+            pHeader->CacheUsage.QuadPart = 0;
+    }
 
     URLCache_DeleteEntry(pHeader, pEntry);
 
@@ -3115,10 +3140,20 @@ BOOL WINAPI DeleteUrlCacheEntryW(LPCWSTR lpszUrlName)
         if (pHeader->directory_data[pUrlEntry->CacheDir].dwNumFiles)
             pHeader->directory_data[pUrlEntry->CacheDir].dwNumFiles--;
     }
-    if (pUrlEntry->size.QuadPart < pHeader->CacheUsage.QuadPart)
-        pHeader->CacheUsage.QuadPart -= pUrlEntry->size.QuadPart;
+    if (pUrlEntry->CacheEntryType & STICKY_CACHE_ENTRY)
+    {
+        if (pUrlEntry->size.QuadPart < pHeader->ExemptUsage.QuadPart)
+            pHeader->ExemptUsage.QuadPart -= pUrlEntry->size.QuadPart;
+        else
+            pHeader->ExemptUsage.QuadPart = 0;
+    }
     else
-        pHeader->CacheUsage.QuadPart = 0;
+    {
+        if (pUrlEntry->size.QuadPart < pHeader->CacheUsage.QuadPart)
+            pHeader->CacheUsage.QuadPart -= pUrlEntry->size.QuadPart;
+        else
+            pHeader->CacheUsage.QuadPart = 0;
+    }
 
     URLCache_DeleteEntry(pHeader, pEntry);