diff --git a/.travis.yml b/.travis.yml
index 5c55ae6..67a336a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,9 +12,10 @@ matrix:
           packages:
             - g++-5
             - libboost1.55-all-dev
-            - libgtest-dev
       env: COMPILER=g++-5
 script:
+  - git submodule init
+  - git submodule update
   - mkdir build
   - cd build
   - cmake .. -DCMAKE_BUILD_TYPE=Debug -DBUILD_TESTS=ON -DCMAKE_CXX_COMPILER=$COMPILER
diff --git a/include/plasp/sas/Debugging.h b/include/plasp/sas/Debugging.h
index 3f8f778..811ec13 100644
--- a/include/plasp/sas/Debugging.h
+++ b/include/plasp/sas/Debugging.h
@@ -16,7 +16,7 @@ namespace sas
 //
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-std::ostream &operator >>(std::ostream &ostream, const Description &description);
+std::ostream &operator <<(std::ostream &ostream, const Description &description);
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
diff --git a/src/plasp/sas/Debugging.cpp b/src/plasp/sas/Debugging.cpp
index f84e8c1..1fb2ffa 100644
--- a/src/plasp/sas/Debugging.cpp
+++ b/src/plasp/sas/Debugging.cpp
@@ -13,7 +13,7 @@ namespace sas
 //
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-std::ostream &operator >>(std::ostream &ostream, const Description &description)
+std::ostream &operator <<(std::ostream &ostream, const Description &description)
 {
 	// Metric section
 	ostream << "uses action costs: " << (description.usesActionCosts() ? "yes" : "no") << std::endl;