diff --git a/src/main/org/apache/tools/ant/taskdefs/condition/Os.java b/src/main/org/apache/tools/ant/taskdefs/condition/Os.java
index 729b985bf..a839a8241 100644
--- a/src/main/org/apache/tools/ant/taskdefs/condition/Os.java
+++ b/src/main/org/apache/tools/ant/taskdefs/condition/Os.java
@@ -222,6 +222,7 @@ public class Os implements Condition {
                     isFamily = osName.indexOf("nonstop_kernel") > -1;
                 } else if (family.equals("unix")) {
                     isFamily = pathSep.equals(":")
+                        && !isFamily("openvms")
                         && (!isFamily("mac") || osName.endsWith("x"));
                 } else if (family.equals("win9x")) {
                     isFamily = isFamily("windows")