diff --git a/modules/calib3d/src/calibration.cpp b/modules/calib3d/src/calibration.cpp
index 0e2b9042db..c71eb93c9e 100644
--- a/modules/calib3d/src/calibration.cpp
+++ b/modules/calib3d/src/calibration.cpp
@@ -2758,7 +2758,7 @@ void cv::reprojectImageTo3D( InputArray _disparity,
     __3dImage.create(disparity.size(), CV_MAKETYPE(dtype, 3));
     Mat _3dImage = __3dImage.getMat();
 
-    const double bigZ = 10000.;
+    const float bigZ = 10000.f;
     Matx44d _Q;
     Q.convertTo(_Q, CV_64F);