diff --git a/contrib/groff/font/devutf8/R.proto b/contrib/groff/font/devutf8/R.proto
index ac0828fe492..3e69500db51 100644
--- a/contrib/groff/font/devutf8/R.proto
+++ b/contrib/groff/font/devutf8/R.proto
@@ -726,7 +726,7 @@ st	24	0	0x220B
 product	24	0	0x220F
 coproduct	24	0	0x2210
 sum	24	0	0x2211
-\-	24	0	0x2212
+\-	24	0	0x002D
 mi	"
 -+	24	0	0x2213
 **	24	0	0x2217