diff --git a/prism/Makefile b/prism/Makefile
index e682bfa6..37a44a1e 100644
--- a/prism/Makefile
+++ b/prism/Makefile
@@ -413,7 +413,7 @@ add_rev:
 
 dist_src: dist_check_version dist_copy clean_all dist_tidy
 
-dist_bin: JFLAGS += -source 1.6 -target 1.6
+dist_bin: JFLAGS += -source 1.7 -target 1.7
 dist_bin: dist_check_version all binary dist_tidy dist_bin_copy
 
 dist_check_version: