diff --git a/corelib/src/clams/slam_calibrator.cpp b/corelib/src/clams/slam_calibrator.cpp
index 767cf009..3d32d1fc 100644
--- a/corelib/src/clams/slam_calibrator.cpp
+++ b/corelib/src/clams/slam_calibrator.cpp
@@ -53,7 +53,7 @@ namespace clams
 
 		// -- For all selected frames, accumulate training examples
 		//    in the distortion model.
-		size_t counts;
+		size_t counts = 0;
 		//#pragma omp parallel for // error on linux
 		for(std::map<int, rtabmap::Transform>::const_iterator iter = trajectory.begin(); iter != trajectory.end(); ++iter)
 		{