diff --git a/ChangeLog b/ChangeLog
index 3f7a2ee0..340a9db3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2010-10-31  Joel E. Denny  <joeldenny@joeldenny.org>
+
+	Fix memory leak.
+	* src/output.c (prepare_rules): Free temporary array.
+
 2010-10-31  Joel E. Denny  <joeldenny@joeldenny.org>
 
 	yysyntax_error: improve invocation readability.
diff --git a/src/output.c b/src/output.c
index 6b29e5c0..1d4c15ad 100644
--- a/src/output.c
+++ b/src/output.c
@@ -249,6 +249,7 @@ prepare_rules (void)
   free (r2);
   free (dprec);
   free (merger);
+  free (immediate);
 }
 
 /*--------------------------------------------.