diff --git a/.travis.yml b/.travis.yml
index 21228fca..ac23f0fe 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,11 +3,12 @@ rust:
   -stable
 
 env:
-  - TEST_DIR=core
-  - TEST_DIR=p2p
-  - TEST_DIR=chain
-  - TEST_DIR=grin
   global:
-    RUST_BACKTRACE="1"
+    - RUST_BACKTRACE="1"
+  matrix:
+    - TEST_DIR=core
+    - TEST_DIR=p2p
+    - TEST_DIR=chain
+    - TEST_DIR=grin
 
 script: cd $TEST_DIR && cargo test --verbose