diff --git a/.gitignore b/.gitignore
index 14942da..21fa7dc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 antlr-2.7.7.tar.gz
+/antlr-2.7.7.pom
diff --git a/antlr.spec b/antlr.spec
index d0c8aaa..a0b0b31 100644
--- a/antlr.spec
+++ b/antlr.spec
@@ -7,14 +7,17 @@
 Summary:       ANother Tool for Language Recognition
 Name:          antlr
 Version:       2.7.7
-Release:       54%{?dist}
+Release:       55%{?dist}
 Epoch:         0
 License:       ANTLR-PD
 URL:           http://www.antlr2.org/
-Source0:       http://www.antlr2.org/download/antlr-%{version}.tar.gz
+# ./generate-tarball.sh
+Source0:       antlr-%{version}.tar.gz
 Source1:       %{name}-build.xml
 Source2:       %{name}-script
 Source3:       http://repo2.maven.org/maven2/antlr/antlr/%{version}/%{name}-%{version}.pom
+# Repack the tarball without prebuilt binaries of unknown origin
+Source4:       generate-tarball.sh
 Patch1:        %{name}-%{version}-newgcc.patch
 # see BZ#848662
 Patch2:        antlr-examples-license.patch
@@ -204,6 +207,9 @@ cd ../..
 %endif
 
 %changelog
+* Tue Jul 24 2018 Michael Simacek <msimacek@redhat.com> - 0:2.7.7-55
+- Repack the tarball without binaries
+
 * Thu Jul 12 2018 Fedora Release Engineering <releng@fedoraproject.org> - 0:2.7.7-54
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_29_Mass_Rebuild
 
diff --git a/generate-tarball.sh b/generate-tarball.sh
new file mode 100755
index 0000000..74b872f
--- /dev/null
+++ b/generate-tarball.sh
@@ -0,0 +1,25 @@
+#!/bin/bash
+set -e
+
+name=antlr
+version="$(sed -n 's/Version:\s*//p' *.spec)"
+
+# RETRIEVE
+wget "http://www.antlr2.org/download/antlr-${version}.tar.gz" -O "${name}-${version}.orig.tar.gz"
+
+rm -rf tarball-tmp
+mkdir tarball-tmp
+cd tarball-tmp
+tar xf "../${name}-${version}.orig.tar.gz"
+
+# CLEAN TARBALL
+# contain questionable things, such as csflex.exe
+find -name '*.jar' -delete
+find -name '*.class' -delete
+find -name '*.exe' -delete
+find -name '*.dll' -delete
+find -name '*.so' -delete
+
+tar cf "../${name}-${version}.tar.gz" *
+cd ..
+rm -r tarball-tmp "${name}-${version}.orig.tar.gz"
diff --git a/sources b/sources
index bd456a4..0c0fb2b 100644
--- a/sources
+++ b/sources
@@ -1,2 +1,2 @@
-01cc9a2a454dd33dcd8c856ec89af090  antlr-2.7.7.tar.gz
-78af3de823003f6d8dded39c70bc30ae  antlr-2.7.7.pom
+SHA512 (antlr-2.7.7.tar.gz) = 7e05d440513663dab1960974ac61694552583bdd20d6eac2bff27f5142b118a26022d910b44312cdac9164b087c7cd4d1c8325e1ec914f9704b3cdd5f4b2b166
+SHA512 (antlr-2.7.7.pom) = 4a34de18bee216852f43efddcd3bced1708548ebff7372b4ec4ecb6c289b36190b4d0d5588b86f9b65b3bc64756290b66bf1d6d9ed49d0cb8b972921829cba9e