diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 9ec3e1c3ddf932daf9016f5327a4aa1db42c0e64..a706580490c700b7f70bbad32a8e239fb8ac732c 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -87,6 +87,8 @@ core_build_linux_34:
   <<: *core_build_job
   variables: &core_build_linux_34_variables
     PYTHON_VERSION: "3.4"
+  only:
+    - master
   tags:
     - conda-linux
 
@@ -102,6 +104,8 @@ extra_build_linux_34:
   variables: *core_build_linux_34_variables
   dependencies:
     - core_build_linux_34
+  only:
+    - master
   tags:
     - conda-linux
 
@@ -180,6 +184,8 @@ core_build_macosx_34:
   <<: *core_build_job
   variables: &core_build_macosx_34_variables
     PYTHON_VERSION: "3.4"
+  only:
+    - master
   tags:
     - conda-macosx
 
@@ -195,6 +201,8 @@ extra_build_macosx_34:
   variables: *core_build_macosx_34_variables
   dependencies:
     - core_build_macosx_34
+  only:
+    - master
   tags:
     - conda-macosx