diff --git a/.travis.yml b/.travis.yml
index eb6f7331..2fc02932 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,17 +18,6 @@ env:
   - PLATFORM=posix TESTS=yes TLS=tinydtls
   - PLATFORM=posix TESTS=yes TLS=mbedtls
 
-matrix:
-  exclude:
-    - compiler: clang
-      env: PLATFORM=posix TESTS=yes TLS=no
-    - compiler: clang
-      env: PLATFORM=posix TESTS=yes TLS=tinydtls
-    - compiler: clang
-      env: PLATFORM=posix TESTS=yes TLS=gnutls SMALL_STACK=yes EPOLL=no
-    - compiler: clang
-      env: PLATFORM=posix TESTS=yes TLS=gnutls SMALL_STACK=no  EPOLL=no
-
 before_install:
   - docker build -t obgm/libcoap:travis-env .
 
@@ -47,21 +36,17 @@ stages:
 jobs:
   include:
     - stage: other platforms
-      compiler: gcc
-      env:
-        - PLATFORM=contiki TLS=no
+      env: PLATFORM=contiki TLS=no
+      before_script:
       script:
         - docker run -e CC -e PLATFORM -e TLS obgm/libcoap:travis-env /bin/sh -c "scripts/build.sh"
     - stage: other platforms
-      compiler: gcc
-      env:
-        - PLATFORM=lwip TLS=no
+      env: PLATFORM=lwip TLS=no
+      before_script:
       script:
         - docker run -e CC -e PLATFORM -e TLS obgm/libcoap:travis-env /bin/sh -c "scripts/build.sh"
     - stage: dist
-      compiler: gcc
-      env:
-        - PLATFORM=posix TESTS=yes TLS=no DOCS=yes
+      env: PLATFORM=posix TESTS=yes TLS=no DOCS=yes
       before_script:
       script:
         - docker run -e CC -e PLATFORM -e TESTS -e DOCS -e TLS obgm/libcoap:travis-env /bin/sh -c "scripts/dist.sh"