diff --git a/src/shogun/multiclass/MulticlassOCAS.cpp b/src/shogun/multiclass/MulticlassOCAS.cpp
index e5ba12c43e2..b02092229c8 100644
--- a/src/shogun/multiclass/MulticlassOCAS.cpp
+++ b/src/shogun/multiclass/MulticlassOCAS.cpp
@@ -90,11 +90,11 @@ bool CMulticlassOCAS::train_machine(CFeatures* data)
 
 	mocas_data user_data;
 	user_data.features = m_features;
-	user_data.W = SG_MALLOC(float64_t, (int64_t)num_features*num_classes);
-	user_data.oldW = SG_MALLOC(float64_t, (int64_t)num_features*num_classes);
-	user_data.new_a = SG_MALLOC(float64_t, (int64_t)num_features*num_classes);
-	user_data.full_A = SG_MALLOC(float64_t, (int64_t)num_features*num_classes*m_buf_size);
-	user_data.output_values = SG_MALLOC(float64_t, num_vectors);
+	user_data.W = SG_CALLOC(float64_t, (int64_t)num_features*num_classes);
+	user_data.oldW = SG_CALLOC(float64_t, (int64_t)num_features*num_classes);
+	user_data.new_a = SG_CALLOC(float64_t, (int64_t)num_features*num_classes);
+	user_data.full_A = SG_CALLOC(float64_t, (int64_t)num_features*num_classes*m_buf_size);
+	user_data.output_values = SG_CALLOC(float64_t, num_vectors);
 	user_data.data_y = labels.vector;
 	user_data.nY = num_classes;
 	user_data.nDim = num_features;