diff --git a/gen/regenerate-meson b/gen/regenerate-meson
index b9cb192..6c32c46 100755
--- a/gen/regenerate-meson
+++ b/gen/regenerate-meson
@@ -1,3 +1,23 @@
-#!/bin/sh
-${SDBUSPP_GEN_MESON:=../subprojects/sdbusplus/tools/sdbus++-gen-meson} \
-    --directory .. --command meson --output .
+#!/bin/bash
+
+REPO_ROOT=$(git rev-parse --show-toplevel)
+
+# Find sdbus++-gen-meson
+#   1. Check $SDBUSPP_GEN_MESON
+#   2. Check in $PATH
+#   3. Check in subprojects/sdbusplus
+if [ ! -x "$SDBUSPP_GEN_MESON" ]; then
+    SDBUSPP_GEN_MESON="$(which sdbus++-gen-meson 2> /dev/null)"
+fi
+if [ ! -x "$SDBUSPP_GEN_MESON" ]; then
+    SDBUSPP_GEN_MESON="$REPO_ROOT/subprojects/sdbusplus/tools/sdbus++-gen-meson"
+fi
+if [ ! -x "$SDBUSPP_GEN_MESON" ]; then
+    echo "Cannot find sdbus++-gen-meson ($SDBUSPP_GEN_MESON)."
+    exit 1
+fi
+
+$SDBUSPP_GEN_MESON \
+    --command meson \
+    --directory $REPO_ROOT \
+    --output $REPO_ROOT/gen