diff --git a/ant.spec b/ant.spec
index cfc9224..abf4820 100644
--- a/ant.spec
+++ b/ant.spec
@@ -430,10 +430,9 @@ mv build/lib0/ant-junit.jar build/lib/
 mv build/lib0/ant-junit4.jar build/lib/
 %endif
 
-for jar in build/lib/*.jar
-do
+for jar in build/lib/*.jar; do
   # Make sure that installed JARs are not empty
-  jar tf ${jar} | egrep -q *.class
+  jar tf ${jar} | grep -E -q '.*\.class'
 
   jarname=$(basename $jar .jar)