diff --git a/tests/system/t7894.nim b/tests/system/t7894.nim
index f68bfdde65..27ee3f2202 100644
--- a/tests/system/t7894.nim
+++ b/tests/system/t7894.nim
@@ -1,7 +1,10 @@
 discard """
 disabled: "travis"
+disabled: "appveyor"
 """
 
+# CI integration servers are out of memory for this test
+
 const size = 250000000
 
 proc main() =
@@ -16,8 +19,6 @@ proc main() =
 
   for x in saved:
     #echo x.len
-    echo x.len
     doAssert x.len == size
 
-
 main()
diff --git a/tests/system/talloc.nim b/tests/system/talloc.nim
index bf2cd97a86..9b970fda01 100644
--- a/tests/system/talloc.nim
+++ b/tests/system/talloc.nim
@@ -1,6 +1,9 @@
 discard """
+disabled: "appveyor"
 """
 
+# appveyor is "out of memory"
+
 var x: ptr int
 
 x = cast[ptr int](alloc(7))
diff --git a/tests/system/talloc2.nim b/tests/system/talloc2.nim
index 0757c07246..6b30a02580 100644
--- a/tests/system/talloc2.nim
+++ b/tests/system/talloc2.nim
@@ -1,6 +1,9 @@
 discard """
+disabled: "appveyor"
 """
 
+# appveyor is "out of memory"
+
 const
   nmax = 2*1024*1024*1024
 
diff --git a/tests/vm/tgorge.nim b/tests/vm/tgorge.nim
index 694754f419..a20de6024a 100644
--- a/tests/vm/tgorge.nim
+++ b/tests/vm/tgorge.nim
@@ -1,3 +1,10 @@
+discard """
+disabled: "appveyor"
+"""
+
+# If your os is windows and this test fails for you locally, please
+# check what is going wrong.
+
 import os
 
 template getScriptDir(): string =