diff --git a/antlr-bootstrap.changes b/antlr-bootstrap.changes
index 2f68097..cf54f13 100644
--- a/antlr-bootstrap.changes
+++ b/antlr-bootstrap.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Fri Feb  1 11:19:37 UTC 2019 - Fridrich Strba <fstrba@suse.com>
+
+- Speed-up build by compiling all *.java files in one javac
+  invocation
+
 -------------------------------------------------------------------
 Tue May 15 05:55:58 UTC 2018 - fstrba@suse.com
 
diff --git a/antlr-bootstrap.spec b/antlr-bootstrap.spec
index 4194151..4191f0d 100644
--- a/antlr-bootstrap.spec
+++ b/antlr-bootstrap.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package antlr-bootstrap
 #
-# Copyright (c) 2018 SUSE LINUX GmbH, Nuernberg, Germany.
+# Copyright (c) 2019 SUSE LINUX GmbH, Nuernberg, Germany.
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -48,10 +48,7 @@ CLASSPATH_ORIG="$CLASSPATH"
 function delBinaryFiles() {
   set +x
   echo deleting binary files ...
-  for file in `find . -name "*.class" -o -name "*.jar" -o -name "*DELETED-BY-PACKAGER*"`
-  do
-    rm -rf $file
-  done
+  find . -name "*.class" -o -name "*.jar" -o -name "*DELETED-BY-PACKAGER*" -delete
   set -x
 }
 #>>> make %{?_smp_mflags} a string with all jar files found in target folder that can be used for a classpath string
@@ -71,19 +68,15 @@ function compileFiles() {
   mkTargetClasspath
   set +x
   COMPILE_CLASSPATH_PATH=.:${JAR_CLASSPATH}
-  echo using: $COMPILER_COMMAND $COMPILE_CLASSPATH_PATH \$file
-  for file in `find . -name "*.java"`
-  do
-    echo -e "$COMPILER_COMMAND $COMPILE_CLASSPATH_PATH $file ... \c"
-    $COMPILER_COMMAND $COMPILE_CLASSPATH_PATH $file
-    # check for errors
-    if [ $? != 0 ]
-    then
-      echo ERROR
-      exit 1;
-    fi
-    echo done
-  done
+  echo -e "$COMPILER_COMMAND $COMPILE_CLASSPATH_PATH $(find . -name "*.java" | xargs)"
+  $COMPILER_COMMAND $COMPILE_CLASSPATH_PATH $(find . -name "*.java" | xargs)
+  # check for errors
+  if [ $? != 0 ]
+  then
+    echo ERROR
+    exit 1;
+  fi
+  echo done
   set -x
 }
 #>>> make %{?_smp_mflags} jar archive
diff --git a/antlr.spec b/antlr.spec
index b0d21d5..6a88038 100644
--- a/antlr.spec
+++ b/antlr.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package antlr
 #
-# Copyright (c) 2018 SUSE LINUX GmbH, Nuernberg, Germany.
+# Copyright (c) 2019 SUSE LINUX GmbH, Nuernberg, Germany.
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed