diff --git a/.travis.yml b/.travis.yml
index 4dbb33274a..38a8ba312c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -29,8 +29,8 @@ matrix:
           name: wxGTK 2 clang Ubuntu 18.04
         - dist: bionic
           compiler: gcc
-          env: wxTOOLSET=cmake wxCMAKE_GENERATOR="Unix Makefiles"
-          name: wxGTK CMake Ubuntu 18.04
+          env: wxGTK_VERSION=3 wxTOOLSET=cmake wxCMAKE_GENERATOR="Unix Makefiles"
+          name: wxGTK 3 CMake Ubuntu 18.04
         - os: osx
           osx_image: xcode6.4
           compiler: clang
diff --git a/build/cmake/toolkit.cmake b/build/cmake/toolkit.cmake
index 6b59ea69e0..2b8dbbe5db 100644
--- a/build/cmake/toolkit.cmake
+++ b/build/cmake/toolkit.cmake
@@ -27,7 +27,7 @@ elseif(APPLE)
     set(wxTOOLKIT_OPTIONS osx_cocoa gtk2 gtk3 gtk4 qt)
     set(wxPLATFORM OSX)
 elseif(UNIX)
-    set(wxDEFAULT_TOOLKIT gtk2)
+    set(wxDEFAULT_TOOLKIT gtk3)
     set(wxTOOLKIT_OPTIONS gtk2 gtk3 gtk4 motif qt)
     set(wxPLATFORM UNIX)
 else()