diff --git a/dcr b/dcr
index 56a4d49..11e1c7f 100755
--- a/dcr
+++ b/dcr
@@ -1,5 +1,10 @@
-#!/bin/sh
+#!/usr/bin/env bash
+BASE_DIR="$(cd "$(dirname "$(readlink -f "$0")")" && pwd)"
 
-BASE_DIR="$(dirname "$(readlink -f "$0")")"
-SRC_DIR="$BASE_DIR/src"
-PYTHONPATH="$SRC_DIR" exec python3 -m dcr.main "$@"
+if command -v python3 >/dev/null 2>&1; then
+    PYTHON_BIN="python3"
+else
+    PYTHON_BIN="$BASE_DIR/Python/bin/python3"
+fi
+
+PYTHONPATH="$BASE_DIR/src" exec "$PYTHON_BIN" -m dcr.main "$@"
diff --git a/install.sh b/install.sh
index c07b4f9..ff17139 100755
--- a/install.sh
+++ b/install.sh
@@ -86,7 +86,7 @@ install_wrapper() {
 
     cat > "$INSTALL_PATH/dcr" <<'EOF'
 #!/usr/bin/env bash
-BASE_DIR="$(cd "$(dirname "$0")" && pwd)"
+BASE_DIR="$(cd "$(dirname "$(readlink -f "$0")")" && pwd)"
 
 if command -v python3 >/dev/null 2>&1; then
     PYTHON_BIN="python3"