c3-lang/libtommath

diff --git a/.travis.yml b/.travis.yml
index a0b11ea..658c9bc 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -94,7 +94,7 @@ matrix:
     - env: SANITIZER=1 BUILDOPTIONS='--with-cc=clang-7 --with-travis-valgrind --make-option=tune'
 
     # clang for x86-64 architecture (64-bit longs and 64-bit pointers)
-    - env: SANITIZER=1 CONV_WARNINGS=relaxed BUILDOPTIONS='--with-cc=clang-7 --with-m64 --with-valgrind'
+    - env: COMPILE_DEBUG=1 SANITIZER=1 CONV_WARNINGS=relaxed BUILDOPTIONS='--with-cc=clang-7 --with-m64 --with-valgrind'
     - env: SANITIZER=1 CONV_WARNINGS=strict BUILDOPTIONS='--with-cc=clang-7 --with-m64 --with-travis-valgrind'
     - env: SANITIZER=1 BUILDOPTIONS='--with-cc=clang-6.0 --with-m64 --with-travis-valgrind'
       addons: