diff --git a/prism/Makefile b/prism/Makefile
index 4a852386..9a045282 100644
--- a/prism/Makefile
+++ b/prism/Makefile
@@ -438,7 +438,7 @@ add_rev:
 
 dist_src: dist_check_version dist_copy clean_all dist_tidy
 
-dist_bin: JFLAGS += -source 1.7 -target 1.7
+dist_bin: JFLAGS += -source 1.8 -target 1.8
 dist_bin: dist_check_version all binary dist_tidy dist_bin_copy
 
 dist_check_version: