The results of the latest data from Valve’s monthly Steam Hardware Survey has revealed that although the Oculus Rift still maintains its lead over the HTC Vive in overall market share, the gap between these two competing high-end PC VR headsets continues its trend to tighten for the second consecutive month.

According to the April figures, which are based on data collected by Valve from Steam users participating in an opt-in survey to determine what kind of hardware and software is being used across the Steam platform, show the Oculus Rift headset maintaining a market share lead now at 45.62% (down from 47.55%), over the HTC Vive, which came in with 41.08% (up from 39.55%). The Vive Pro, meanwhile, came in at 1.51% (up from 1.45%).

As for Windows VR headsets, the data results appear to show that these headsets continue on a slow, but steady trend upward, coming in at 11.07% (up from 10.56%). It will be interesting to see how the VR landscape shapes up once Oculus’ upcoming Rift S debuts later this month, and Valve’s Index headset hits the market in June.