diff --git a/ci/scripts/proto/generate.sh b/ci/scripts/proto/generate.sh
index eb178f8..ac4a247 100755
--- a/ci/scripts/proto/generate.sh
+++ b/ci/scripts/proto/generate.sh
@@ -9,7 +9,7 @@ PROTO_DIR="./proto"
 PROTOC_BIN="${PROTOC:-protoc}"
 PROTOC_INCLUDE="${PROTOC_INCLUDE:-/usr/include}"
 if [ ! -f "${PROTOC_INCLUDE}/google/protobuf/timestamp.proto" ]; then
-  for candidate in /usr/include /usr/local/include /usr/lib/include /usr/local/share/include; do
+for candidate in /usr/include /usr/local/include /usr/lib/include /usr/local/share/include "$(dirname "$(command -v protoc)")/../include"; do
     if [ -f "${candidate}/google/protobuf/timestamp.proto" ]; then
       PROTOC_INCLUDE="${candidate}"
       break