Try release build for Travis.
diff --git a/.travis.yml b/.travis.yml
index a1f922b..0d2fed2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -47,6 +47,6 @@
   - ./build_glslang_spirv_tools.sh Release
   - mkdir build
   - cd build
-  - cmake .. -DCMAKE_BUILD_TYPE=Debug -G "${GENERATOR}" -DPYTHON_EXECUTABLE:FILEPATH="${PYTHON3}"
-  - cmake --build .
-  - PATH="../external/glslang-build/output/bin:../external/spirv-tools-build/output/bin:$PATH" ctest --verbose -C Debug
+  - cmake .. -DCMAKE_BUILD_TYPE=Release -G "${GENERATOR}" -DPYTHON_EXECUTABLE:FILEPATH="${PYTHON3}"
+  - cmake --build . --config Release
+  - PATH="../external/glslang-build/output/bin:../external/spirv-tools-build/output/bin:$PATH" ctest --verbose -C Release
diff --git a/build_glslang_spirv_tools.sh b/build_glslang_spirv_tools.sh
index 1095f30..7689c26 100755
--- a/build_glslang_spirv_tools.sh
+++ b/build_glslang_spirv_tools.sh
@@ -13,13 +13,13 @@
 mkdir -p external/glslang-build
 cd external/glslang-build
 cmake ../glslang -DCMAKE_BUILD_TYPE=$PROFILE -DCMAKE_INSTALL_PREFIX=output
-cmake --build . --target install ${NPROC}
+cmake --build . --config $PROFILE --target install ${NPROC}
 cd ../..
 
 echo "Building SPIRV-Tools."
 mkdir -p external/spirv-tools-build
 cd external/spirv-tools-build
 cmake ../spirv-tools -DCMAKE_BUILD_TYPE=$PROFILE -DSPIRV_WERROR=OFF -DCMAKE_INSTALL_PREFIX=output
-cmake --build . --target install ${NPROC}
+cmake --build . --config $PROFILE --target install ${NPROC}
 cd ../..