diff --git a/sonic-slave-buster/Dockerfile.j2 b/sonic-slave-buster/Dockerfile.j2
index 8441a53dca..f835f59d1e 100644
--- a/sonic-slave-buster/Dockerfile.j2
+++ b/sonic-slave-buster/Dockerfile.j2
@@ -254,6 +254,8 @@ RUN apt-get update && apt-get install -y \
 # For gtest
         libgtest-dev \
         cmake \
+# For gmock
+        libgmock-dev \
 # For pam_tacplus build
         autoconf-archive \
 # For iproute2