diff --git a/Tools/ChangeLog b/Tools/ChangeLog
index 8702d86..025e1bc 100644
--- a/Tools/ChangeLog
+++ b/Tools/ChangeLog
@@ -1,5 +1,11 @@
 2019-10-21  Carlos Garcia Campos  <cgarcia@igalia.com>
 
+        Unreviewed. Mark some more WTF unit tests as slow for GTK and WPE
+
+        * TestWebKitAPI/glib/TestExpectations.json:
+
+2019-10-21  Carlos Garcia Campos  <cgarcia@igalia.com>
+
         [GTK][WPE] Check we don't leak the WebKitWebContext in all tests
         https://bugs.webkit.org/show_bug.cgi?id=202981
 
diff --git a/Tools/TestWebKitAPI/glib/TestExpectations.json b/Tools/TestWebKitAPI/glib/TestExpectations.json
index 4c2503b..a468a9b 100644
--- a/Tools/TestWebKitAPI/glib/TestExpectations.json
+++ b/Tools/TestWebKitAPI/glib/TestExpectations.json
@@ -131,9 +131,21 @@
     },
     "TestWTF": {
         "subtests": {
+            "ThreadMessage.MultipleSenders": {
+                "expected": {"all": {"slow": true}}
+            },
             "WTF_Condition.TenProducersTenConsumersOneSlot": {
                 "expected": {"all": {"slow": true}}
             },
+            "WTF_Condition.TenProducersOneConsumerOneSlot": {
+                "expected": {"all": {"slow": true}}
+            },
+            "WTF_Condition.OneProducerOneConsumerOneSlot": {
+                "expected": {"all": {"slow": true}}
+            },
+            "WTF_Condition.OneProducerOneConsumerOneSlotTimeout": {
+                "expected": {"all": {"slow": true}}
+            },
             "WTF_DateMath.calculateLocalTimeOffset": {
                 "expected": {"wpe": {"status": ["FAIL"]}}
             },
@@ -149,6 +161,9 @@
             "WTF_Lock.ManyContendedShortSections": {
                 "expected": {"all": {"slow": true, "status": ["TIMEOUT", "PASS"]}}
             },
+            "WTF_ParkingLot.UnparkAllHundred": {
+                "expected": {"all": {"slow": true}}
+            },
             "WTF_WordLock.ContendedShortSection": {
                 "expected": {"all": {"slow": true}}
             },