diff --git a/scripts/crosstool-NG.sh.in b/scripts/crosstool-NG.sh.in
index 4b2e14f4..ae725eb4 100644
--- a/scripts/crosstool-NG.sh.in
+++ b/scripts/crosstool-NG.sh.in
@@ -66,6 +66,9 @@ for d in            \
             *" "*)
                 CT_Abort "'CT_${d}_DIR'='${dir}' contains a space in it.\nDon't use spaces in paths, it breaks things."
                 ;;
+            *:*)
+                CT_Abort "'CT_${d}_DIR'='${dir}' contains a colon in it.\nDon't use colons in paths, it breaks things."
+                ;;
         esac
 done