diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index bf975fcd47..30a4399553 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -4,7 +4,7 @@
 # It needs to be regenerated every time a defconfig is added, using
 # "make .gitlab-ci.yml".
 
-image: buildroot/base
+image: buildroot/base:20180205.0730
 
 .defconfig_script: &defconfig_script
     - echo 'Configure Buildroot'
diff --git a/.gitlab-ci.yml.in b/.gitlab-ci.yml.in
index f763fdd454..cb3eb715f2 100644
--- a/.gitlab-ci.yml.in
+++ b/.gitlab-ci.yml.in
@@ -4,7 +4,7 @@
 # It needs to be regenerated every time a defconfig is added, using
 # "make .gitlab-ci.yml".
 
-image: buildroot/base
+image: buildroot/base:20180205.0730
 
 .defconfig_script: &defconfig_script
     - echo 'Configure Buildroot'