diff --git a/modules/ocl/src/haar.cpp b/modules/ocl/src/haar.cpp
index 6283ac8d9f..934957e593 100644
--- a/modules/ocl/src/haar.cpp
+++ b/modules/ocl/src/haar.cpp
@@ -262,7 +262,7 @@ static GpuHidHaarClassifierCascade * gpuCreateHidHaarClassifierCascade( CvHaarCl
     int datasize;
     int total_classifiers = 0;
     int total_nodes = 0;
-    char errorstr[100];
+    char errorstr[256];
 
     GpuHidHaarStageClassifier *stage_classifier_ptr;
     GpuHidHaarClassifier *haar_classifier_ptr;