diff --git a/scripts/build/golang-darwin.sh b/scripts/build/golang-darwin.sh
index fddd4bc4f..d2e72eac9 100644
--- a/scripts/build/golang-darwin.sh
+++ b/scripts/build/golang-darwin.sh
@@ -17,9 +17,15 @@ rm -rf "${BACKEND_DIR}"/build-*
 # run.sh's final `exec $CURDIR/<binary>` is the contract for what gets launched;
 # the binary is not always named after the backend (e.g. parakeet-cpp launches
 # parakeet-cpp-grpc), so derive it from run.sh and fall back to ${BACKEND}.
+#
+# Only scan the `exec` line(s): many run.sh select a runtime CPU variant via
+# unquoted `LIBRARY=$CURDIR/libgo<x>-avx512.so` lines, and a whole-file grep
+# would pick the last of those (avx512, which Darwin never builds) instead of
+# the binary — failing the check below for whisper/sam3-cpp/vibevoice-cpp/...
+# Also tolerate the exec being quoted (`exec "$CURDIR"/<binary>`).
 RUN_BINARY=""
 if [ -f "${BACKEND_DIR}/run.sh" ]; then
-        RUN_BINARY=$(grep -oE '\$CURDIR/[A-Za-z0-9._-]+' "${BACKEND_DIR}/run.sh" | grep -v 'ld\.so' | tail -1 | sed 's|\$CURDIR/||')
+        RUN_BINARY=$(grep -E '^[[:space:]]*exec[[:space:]]' "${BACKEND_DIR}/run.sh" | grep -oE '"?\$CURDIR"?/[A-Za-z0-9._-]+' | grep -v 'ld\.so' | tail -1 | sed -E 's|"?\$CURDIR"?/||')
 fi
 RUN_BINARY="${RUN_BINARY:-${BACKEND}}"