diff --git a/build.xml b/build.xml
index 5bf4fec72..409c34470 100644
--- a/build.xml
+++ b/build.xml
@@ -145,6 +145,7 @@
     </target>
 
     <target name="som-tests" depends="compile">
+      <delete file="all.gcov" /> <!-- delete old coverage data, this should be the first task generating coverage data -->
       <exec executable="./som" failonerror="true">
         <arg value="--coverage" />
         <arg value="all.gcov" />
diff --git a/tests/dym/test.sh b/tests/dym/test.sh
index 7cf159159..14f6d945e 100755
--- a/tests/dym/test.sh
+++ b/tests/dym/test.sh
@@ -20,7 +20,6 @@ mkdir -p $SCRIPT_PATH/results/
 tar xf $SCRIPT_PATH/expected-results.tar.bz2 -C $SCRIPT_PATH/
 
 function runBenchmark {
-  rm -f $SOM_DIR/all.gcov
   BENCH=$1
   HARNESS="$SOM_DIR/som -dm -Ddm.metrics=$SCRIPT_PATH/results/$BENCH \
     --coverage $SOM_DIR/all.gcov \