diff --git a/src/main/java/org/apache/sysds/hops/estim/EstimatorMatrixHistogram.java b/src/main/java/org/apache/sysds/hops/estim/EstimatorMatrixHistogram.java
index 9bfecabaea9..f545d0d06ed 100644
--- a/src/main/java/org/apache/sysds/hops/estim/EstimatorMatrixHistogram.java
+++ b/src/main/java/org/apache/sysds/hops/estim/EstimatorMatrixHistogram.java
@@ -386,7 +386,7 @@ public static DataCharacteristics deriveOutputCharacteristics(MatrixHistogram h1
 					return new MatrixCharacteristics(h1.getRows(), h1.getCols(),
 						OptimizerUtils.getNnz(h1.getRows(), h1.getCols(), spOut));
 				case RBIND:
-					return new MatrixCharacteristics(h1.getRows()+h1.getRows(), h1.getCols(),
+					return new MatrixCharacteristics(h1.getRows()+h2.getRows(), h1.getCols(),
 						OptimizerUtils.getNnz(h1.getRows()+h2.getRows(), h1.getCols(), spOut));
 				case CBIND:
 					return new MatrixCharacteristics(h1.getRows(), h1.getCols()+h2.getCols(),