diff --git a/.travis.yml b/.travis.yml
index 66095f5..6a0d159 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,5 +7,6 @@ compiler:
   - gcc
   - clang
 
-script: 
+script:
   - make -C cimgui
+  - $CC cimgui/cimgui.h    # Make sure we can include in a plain C compiler