diff --git a/eclipse.spec b/eclipse.spec
index 76d1e8a..d3f1f4d 100644
--- a/eclipse.spec
+++ b/eclipse.spec
@@ -292,7 +292,7 @@ sed --in-place "s/java5.home/java.home/" build.xml
 %patch32 -p0
 
 # Use ECJ for GCJ's bytecode compiler
-tar zxf %{SOURCE29}
+tar jxf %{SOURCE29}
 mv eclipse-gcj/org/eclipse/jdt/internal/compiler/batch/GCCMain.java \
   plugins/org.eclipse.jdt.core/batch/org/eclipse/jdt/internal/compiler/batch/
 cat eclipse-gcj/gcc.properties >> \