diff --git a/dev-python/pypy3/pypy3-5.7.1-r2.ebuild b/dev-python/pypy3/pypy3-5.7.1-r2.ebuild
index 52a451c5e185d..e0a8417672eaa 100644
--- a/dev-python/pypy3/pypy3-5.7.1-r2.ebuild
+++ b/dev-python/pypy3/pypy3-5.7.1-r2.ebuild
@@ -102,7 +102,7 @@ src_configure() {
 		$(usex jit -Ojit -O2)
 		$(usex sandbox --sandbox '')
 
-		--jit_backend=auto
+		--jit-backend=auto
 
 		pypy/goal/targetpypystandalone
 	)
diff --git a/dev-python/pypy3/pypy3-5.8.0.ebuild b/dev-python/pypy3/pypy3-5.8.0.ebuild
index c51213fe70ecf..e2f58d805be10 100644
--- a/dev-python/pypy3/pypy3-5.8.0.ebuild
+++ b/dev-python/pypy3/pypy3-5.8.0.ebuild
@@ -100,7 +100,7 @@ src_configure() {
 		$(usex jit -Ojit -O2)
 		$(usex sandbox --sandbox '')
 
-		--jit_backend=auto
+		--jit-backend=auto
 
 		pypy/goal/targetpypystandalone
 	)