diff --git a/media-libs/openxr-loader/openxr-loader-1.1.40.ebuild b/media-libs/openxr-loader/openxr-loader-1.1.40-r1.ebuild
similarity index 97%
rename from media-libs/openxr-loader/openxr-loader-1.1.40.ebuild
rename to media-libs/openxr-loader/openxr-loader-1.1.40-r1.ebuild
index 0a7f9f4190..7e76b7f7a8 100644
--- a/media-libs/openxr-loader/openxr-loader-1.1.40.ebuild
+++ b/media-libs/openxr-loader/openxr-loader-1.1.40-r1.ebuild
@@ -55,6 +55,7 @@ src_configure() {
 		-DBUILD_WITH_XLIB_HEADERS=$(usex X)
 		-DBUILD_WITH_XCB_HEADERS=$(usex X)
 		-DBUILD_WITH_WAYLAND_HEADERS=$(usex wayland)
+		-DBUILD_WITH_SYSTEM_JSONCPP=YES
 		-DPRESENTATION_BACKEND=$(usex X xlib wayland)
 	)
 
diff --git a/media-libs/openxr-loader/openxr-loader-9999.ebuild b/media-libs/openxr-loader/openxr-loader-9999.ebuild
index 0a7f9f4190..7e76b7f7a8 100644
--- a/media-libs/openxr-loader/openxr-loader-9999.ebuild
+++ b/media-libs/openxr-loader/openxr-loader-9999.ebuild
@@ -55,6 +55,7 @@ src_configure() {
 		-DBUILD_WITH_XLIB_HEADERS=$(usex X)
 		-DBUILD_WITH_XCB_HEADERS=$(usex X)
 		-DBUILD_WITH_WAYLAND_HEADERS=$(usex wayland)
+		-DBUILD_WITH_SYSTEM_JSONCPP=YES
 		-DPRESENTATION_BACKEND=$(usex X xlib wayland)
 	)