diff --git a/.travis.yml b/.travis.yml
index 204f2657..9dad6b1d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -100,4 +100,4 @@ script:
   # NNUE testing
   - export CXXFLAGS="-O1 -fno-inline"
   - make clean && make -j2 ARCH=x86-64-modern debug=no optimize=no build > /dev/null && ../tests/instrumented_learn.sh --valgrind
-  - make clean && make -j2 ARCH=x86-64-modern sanitize=undefined optimize=no debug=no build > /dev/null && ../tests/instrumented_learn.sh --sanitizer-undefined
+  - make clean && make -j2 ARCH=x86-64-modern sanitize=undefined optimize=no debug=yes build > /dev/null && ../tests/instrumented_learn.sh --sanitizer-undefined