diff --git a/lib-src/audacity-patches.txt b/lib-src/audacity-patches.txt
index dffaa895b..eeed75963 100644
--- a/lib-src/audacity-patches.txt
+++ b/lib-src/audacity-patches.txt
@@ -267,7 +267,7 @@ twolame
 http://www.twolame.org/
 MPEG I layer 2 audio encoding library used for MP2 exports
 Version in Audacity SVN: 0.3.13
-Patches: None
+Patches: fix-tests.patch: Terminate AM_TESTS_ENVIRONMENT by a semicolon.
 AM_MAINTAINER_MODE has been added to configure.ac to disable autotools rebuilds
 by default
 Upstream Version: 0.3.13
diff --git a/lib-src/twolame/fix-tests.patch b/lib-src/twolame/fix-tests.patch
new file mode 100644
index 000000000..30d2e4d36
--- /dev/null
+++ b/lib-src/twolame/fix-tests.patch
@@ -0,0 +1,16 @@
+Description: Terminate AM_TESTS_ENVIRONMENT by a semicolon.
+ The automake manual says: "the contents of a non-empty AM_TESTS_ENVIRONMENT
+ must be terminated by a semicolon." Without the semicolon, the perl command
+ will indefinitely wait for input from stdin.
+Index: tests/Makefile.am
+===================================================================
+--- tests/Makefile.am	(revision 12957)
++++ tests/Makefile.am	(working copy)
+@@ -5,6 +5,6 @@
+ TESTS_ENVIRONMENT = \
+ 	TWOLAME_CMD="$(top_builddir)/frontend/twolame" \
+ 	STWOLAME_CMD="$(top_builddir)/simplefrontend/stwolame" \
+-	perl -w -Mstrict -MTest::Harness -e "runtests(@ARGV)"
++	perl -w -Mstrict -MTest::Harness -e "runtests(@ARGV)";
+ 
+ CLEANFILES = *.mp2 *.raw
diff --git a/lib-src/twolame/tests/Makefile.am b/lib-src/twolame/tests/Makefile.am
index 4a4066dc2..fc058effe 100644
--- a/lib-src/twolame/tests/Makefile.am
+++ b/lib-src/twolame/tests/Makefile.am
@@ -5,6 +5,6 @@ TESTS = $(dist_check_SCRIPTS)
 TESTS_ENVIRONMENT = \
 	TWOLAME_CMD="$(top_builddir)/frontend/twolame" \
 	STWOLAME_CMD="$(top_builddir)/simplefrontend/stwolame" \
-	perl -w -Mstrict -MTest::Harness -e "runtests(@ARGV)"
+	perl -w -Mstrict -MTest::Harness -e "runtests(@ARGV)";
 
 CLEANFILES = *.mp2 *.raw