diff --git a/build.sh b/build.sh
index 6fe36a5..c910396 100755
--- a/build.sh
+++ b/build.sh
@@ -18,8 +18,18 @@ fi
 echo "Detect version using git describe..."
 VERSION="$( git describe --tags|sed 's/^[^0-9]*//' )"
 
-echo "Set version=$VERSION in setup.py using sed..."
-sed -i "s/^version *=.*$/version = '$VERSION'/" setup.py
+echo "Computing python version..."
+if [ $( echo "$VERSION"|grep -c "-" ) -gt 0 ]
+then
+	echo "Development version detected ($VERSION), compute custom python dev version"
+	PY_VERSION="$( echo "$VERSION"|sed 's/-\([0-9]\)\+-.*$/.dev\1/' )"
+else
+	echo "Clean tagged version detected, use it"
+	PY_VERSION="$VERSION"
+fi
+
+echo "Set version=$PY_VERSION in setup.py using sed..."
+sed -i "s/^version *=.*$/version = '$PY_VERSION'/" setup.py
 
 if [ -d venv ]
 then