diff --git a/org.eclipse.tm.terminal.telnet/build.properties b/org.eclipse.tm.terminal.telnet/build.properties
index 409ecf091b8..aaf3b659f0e 100644
--- a/org.eclipse.tm.terminal.telnet/build.properties
+++ b/org.eclipse.tm.terminal.telnet/build.properties
@@ -24,4 +24,7 @@ bin.includes = .,\
 source.. = src/
 output.. = bin/
 src.includes = about.html
+javacTarget = 1.4
+javacSource = 1.4
+javacErrors.. = -assertIdentifier