diff --git a/src/main/org/apache/tools/ant/taskdefs/Execute.java b/src/main/org/apache/tools/ant/taskdefs/Execute.java
index 55f7d6a37..779499546 100644
--- a/src/main/org/apache/tools/ant/taskdefs/Execute.java
+++ b/src/main/org/apache/tools/ant/taskdefs/Execute.java
@@ -124,7 +124,7 @@ public class Execute {
             // Ignore and keep trying
         }
 
-        if (Os.isFamily("mac")) {
+        if (Os.isFamily("mac") && !Os.isFamily("unix")) {
             // Mac
             shellLauncher = new MacCommandLauncher(new CommandLauncher());
         } else if (Os.isFamily("os/2")) {