diff --git a/SUPipedUnarchiver.m b/SUPipedUnarchiver.m
index 08246647e..e70f0797d 100644
--- a/SUPipedUnarchiver.m
+++ b/SUPipedUnarchiver.m
@@ -51,6 +51,7 @@ - (void)extractArchivePipingDataToCommand:(NSString *)command
 
 	NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
 	FILE *fp = NULL, *cmdFP = NULL;
+    char *oldDestinationString = NULL;
 	
 	SULog(@"Extracting %@ using '%@'",archivePath,command);
     
@@ -67,7 +68,7 @@ - (void)extractArchivePipingDataToCommand:(NSString *)command
 	fp = fopen([archivePath fileSystemRepresentation], "r");
 	if (!fp) goto reportError;
 	
-    char *oldDestinationString = getenv("DESTINATION");
+    oldDestinationString = getenv("DESTINATION");
 	setenv("DESTINATION", [[archivePath stringByDeletingLastPathComponent] fileSystemRepresentation], 1);
 	cmdFP = popen([command fileSystemRepresentation], "w");
 	size_t written;