diff --git a/src/shogun/preprocessor/LogPlusOne.cpp b/src/shogun/preprocessor/LogPlusOne.cpp
index c9dcf97a2cf..b8d66073d1f 100644
--- a/src/shogun/preprocessor/LogPlusOne.cpp
+++ b/src/shogun/preprocessor/LogPlusOne.cpp
@@ -45,9 +45,9 @@ bool CLogPlusOne::save(FILE* f)
 
 SGMatrix<float64_t> CLogPlusOne::apply_to_matrix(SGMatrix<float64_t> matrix)
 {
-	for (auto i : range(matrix.num_cols))
+	for (auto j : range(matrix.num_cols))
 	{
-		for (auto j : range(matrix.num_rows))
+		for (auto i : range(matrix.num_rows))
 			matrix(i, j) = std::log(matrix(i, j) + 1.0);
 	}
 	return matrix;