diff --git a/build.xml b/build.xml
index 3587133a..ef954b06 100644
--- a/build.xml
+++ b/build.xml
@@ -48,7 +48,7 @@
 	<macrodef name="release-sign">
 		<element name="filesets" implicit="yes" />
 		<sequential>
-			<apply executable="gpg" verbose="yes">
+			<apply executable="gpg" verbose="yes" failonerror="yes">
 				<arg line="--verbose --batch --yes --local-user ${package.maintainer}" />
 				<arg line="--armor --detach-sign" />
 				<srcfile />