diff --git a/travis/jdk/macosx/gama-headless.sh b/travis/jdk/macosx/gama-headless.sh
index f5d0421cfa..866cf2a0d5 100755
--- a/travis/jdk/macosx/gama-headless.sh
+++ b/travis/jdk/macosx/gama-headless.sh
@@ -49,7 +49,7 @@ if [ $workspaceCreate -eq 0 ]; then
 # w/o output folder
 else
   # create workspace in current folder
-  passWork=.workspace$(find ./ -maxdepth 1 -name ".workspace*" | wc -l)
+  passWork=.workspace$(find ./ -maxdepth 1 -name ".workspace*" | expr $(wc -l))
 fi
 
 if ! "$( dirname "${BASH_SOURCE[0]}" )"/../jdk/Contents/Home/bin/java -cp "$( dirname "${BASH_SOURCE[0]}" )"/../Eclipse/plugins/org.eclipse.equinox.launcher*.jar -Xms512m $memory -Djava.awt.headless=true org.eclipse.core.launcher.Main -configuration "$( dirname "${BASH_SOURCE[0]}" )"/configuration -application msi.gama.headless.product -data $passWork "$@"; then
diff --git a/ummisco.gama.product/extraresources/headless/osx/gama-headless.sh b/ummisco.gama.product/extraresources/headless/osx/gama-headless.sh
index c2b029738a..c8903431ef 100755
--- a/ummisco.gama.product/extraresources/headless/osx/gama-headless.sh
+++ b/ummisco.gama.product/extraresources/headless/osx/gama-headless.sh
@@ -57,7 +57,7 @@ if [ $workspaceCreate -eq 0 ]; then
 # w/o output folder
 else
   # create workspace in current folder
-  passWork=.workspace$(find ./ -maxdepth 1 -name ".workspace*" | wc -l)
+  passWork=.workspace$(find ./ -maxdepth 1 -name ".workspace*" | expr $(wc -l))
 fi
 
 if ! java -cp "$( dirname "${BASH_SOURCE[0]}" )"/../Eclipse/plugins/org.eclipse.equinox.launcher*.jar -Xms512m $memory -Djava.awt.headless=true org.eclipse.core.launcher.Main -configuration "$( dirname "${BASH_SOURCE[0]}" )"/configuration -application msi.gama.headless.product -data $passWork "$@"; then