diff --git a/exe/FaceLandmarkImg/FaceLandmarkImg.cpp b/exe/FaceLandmarkImg/FaceLandmarkImg.cpp
index 931bc84..718d3ec 100644
--- a/exe/FaceLandmarkImg/FaceLandmarkImg.cpp
+++ b/exe/FaceLandmarkImg/FaceLandmarkImg.cpp
@@ -224,7 +224,7 @@ void write_out_landmarks(const string& outfeatures, const LandmarkDetector::CLNF
 		featuresFile << "au intensities: " << au_intensities.size() << endl;
 		featuresFile << "{" << endl;
 
-		for (int i = 0; i < au_intensities.size(); ++i)
+		for (size_t i = 0; i < au_intensities.size(); ++i)
 		{
 			// Use matlab format, so + 1
 			featuresFile << au_intensities[i].first << " " << au_intensities[i].second << endl;
@@ -236,7 +236,7 @@ void write_out_landmarks(const string& outfeatures, const LandmarkDetector::CLNF
 		featuresFile << "au occurences: " << au_occurences.size() << endl;
 		featuresFile << "{" << endl;
 
-		for (int i = 0; i < au_occurences.size(); ++i)
+		for (size_t i = 0; i < au_occurences.size(); ++i)
 		{
 			// Use matlab format, so + 1
 			featuresFile << au_occurences[i].first << " " << au_occurences[i].second << endl;
diff --git a/exe/FeatureExtraction/FeatureExtraction.cpp b/exe/FeatureExtraction/FeatureExtraction.cpp
index 7139d91..06cea37 100644
--- a/exe/FeatureExtraction/FeatureExtraction.cpp
+++ b/exe/FeatureExtraction/FeatureExtraction.cpp
@@ -786,7 +786,7 @@ void post_process_output_file(FaceAnalysis::FaceAnalyser& face_analyser, string
 
 	int begin_ind = -1;
 	
-	for (int i = 0; i < tokens.size(); ++i)
+	for (size_t i = 0; i < tokens.size(); ++i)
 	{
 		if (tokens[i].find("AU") != string::npos && begin_ind == -1)
 		{
@@ -802,14 +802,14 @@ void post_process_output_file(FaceAnalysis::FaceAnalyser& face_analyser, string
 	outfile << output_file_contents[0].c_str() << endl;
 	
 	// Write the contents
-	for (int i = 1; i < output_file_contents.size(); ++i)
+	for (size_t i = 1; i < output_file_contents.size(); ++i)
 	{
 		std::vector<std::string> tokens;
 		boost::split(tokens, output_file_contents[i], boost::is_any_of(","));
 
 		outfile << tokens[0];
 
-		for (int t = 1; t < tokens.size(); ++t)
+		for (size_t t = 1; t < tokens.size(); ++t)
 		{
 			if (t >= begin_ind && t < end_ind)
 			{
diff --git a/lib/local/FaceAnalyser/src/FaceAnalyser.cpp b/lib/local/FaceAnalyser/src/FaceAnalyser.cpp
index 3b24211..ae26d73 100644
--- a/lib/local/FaceAnalyser/src/FaceAnalyser.cpp
+++ b/lib/local/FaceAnalyser/src/FaceAnalyser.cpp
@@ -707,7 +707,7 @@ void FaceAnalyser::ExtractAllPredictionsOfflineReg(vector<std::pair<std::string,
 
 			// Find the current id of the AU and the corresponding cutoff
 			int au_id = -1;
-			for (int a = 0; a < dyn_au_names.size(); ++a)
+			for (size_t a = 0; a < dyn_au_names.size(); ++a)
 			{
 				if (au_name.compare(dyn_au_names[a]) == 0)
 				{
diff --git a/lib/local/LandmarkDetector/src/LandmarkDetectorModel.cpp b/lib/local/LandmarkDetector/src/LandmarkDetectorModel.cpp
index 76ff196..6669584 100644
--- a/lib/local/LandmarkDetector/src/LandmarkDetectorModel.cpp
+++ b/lib/local/LandmarkDetector/src/LandmarkDetectorModel.cpp
@@ -645,7 +645,7 @@ bool CLNF::DetectLandmarks(const cv::Mat_<uchar> &image, const cv::Mat_<float> &
 		if(parts_used)
 		{
 
-			for (int part_model = 0; part_model < hierarchical_models.size(); ++part_model)
+			for (size_t part_model = 0; part_model < hierarchical_models.size(); ++part_model)
 			{
 				vector<pair<int, int>> mappings = this->hierarchical_mapping[part_model];