diff --git a/.travis.yml b/.travis.yml
index 1b4ee6f2..1ed4c9de 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,6 +13,7 @@ matrix:
           packages:
             - valgrind
             - python3
+            - python3-dev
             - python3-pip
     - os: linux
       compiler: clang
@@ -23,6 +24,7 @@ matrix:
           packages:
             - valgrind
             - python3
+            - python3-dev
             - python3-pip
     - os: osx
       osx_image: xcode10.1