diff --git a/cpp/core/src/zxing/common/GreyscaleLuminanceSource.cpp b/cpp/core/src/zxing/common/GreyscaleLuminanceSource.cpp
index 4910b653d..b6c917f5c 100644
--- a/cpp/core/src/zxing/common/GreyscaleLuminanceSource.cpp
+++ b/cpp/core/src/zxing/common/GreyscaleLuminanceSource.cpp
@@ -35,7 +35,7 @@ GreyscaleLuminanceSource::GreyscaleLuminanceSource(unsigned char* greyData, int
 
 unsigned char* GreyscaleLuminanceSource::getRow(int y, unsigned char* row) {
   if (y < 0 || y >= this->getHeight()) {
-    throw IllegalArgumentException("Requested row is outside the image: " + y);
+    throw IllegalArgumentException("Requested row is outside the image.");
   }
   int width = getWidth();
   // TODO(flyashi): determine if row has enough size.
diff --git a/cpp/core/src/zxing/common/GreyscaleRotatedLuminanceSource.cpp b/cpp/core/src/zxing/common/GreyscaleRotatedLuminanceSource.cpp
index 498b5ea0d..a5dc35492 100644
--- a/cpp/core/src/zxing/common/GreyscaleRotatedLuminanceSource.cpp
+++ b/cpp/core/src/zxing/common/GreyscaleRotatedLuminanceSource.cpp
@@ -39,7 +39,7 @@ GreyscaleRotatedLuminanceSource::GreyscaleRotatedLuminanceSource(unsigned char*
 // The API asks for rows, but we're rotated, so we return columns.
 unsigned char* GreyscaleRotatedLuminanceSource::getRow(int y, unsigned char* row) {
   if (y < 0 || y >= getHeight()) {
-    throw IllegalArgumentException("Requested row is outside the image: " + y);
+    throw IllegalArgumentException("Requested row is outside the image.");
   }
   int width = getWidth();
   if (row == NULL) {