diff --git a/src/openpose/hand/handExtractor.cpp b/src/openpose/hand/handExtractor.cpp
index 6d188da6dfc4f9f149a62dbe7585c855085dfdd7..d4fda8031c49669765566aa0df73241b66b00a98 100644
--- a/src/openpose/hand/handExtractor.cpp
+++ b/src/openpose/hand/handExtractor.cpp
@@ -165,7 +165,7 @@ namespace op
 
                 // Set hand size
                 const auto numberPeople = (int)handRectangles.size();
-                mHandKeypoints[0].reset({numberPeople, HAND_NUMBER_PARTS, 3}, 0);
+                mHandKeypoints[0].reset({numberPeople, (int)HAND_NUMBER_PARTS, 3}, 0);
                 mHandKeypoints[1].reset(mHandKeypoints[0].getSize(), 0);
 
                 // // Debugging