diff --git a/x11-wm/mutter/mutter-44.3.ebuild b/x11-wm/mutter/mutter-44.3.ebuild
index 00c6855daa5cc..cd00690a208a2 100644
--- a/x11-wm/mutter/mutter-44.3.ebuild
+++ b/x11-wm/mutter/mutter-44.3.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2023 Gentoo Authors
+# Copyright 1999-2024 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -164,7 +164,7 @@ src_configure() {
 		# - https://bugs.gentoo.org/835786
 		# - https://forums.gentoo.org/viewtopic-p-8695669.html
 
-		--buildtype $(usex debug debug plain)
+		-Dbuildtype=$(usex debug debug plain)
 		-Dopengl=true
 		$(meson_use wayland gles2)
 		#gles2_libname
diff --git a/x11-wm/mutter/mutter-44.4.ebuild b/x11-wm/mutter/mutter-44.4.ebuild
index 93a17bb515c84..c8f15b620b6cf 100644
--- a/x11-wm/mutter/mutter-44.4.ebuild
+++ b/x11-wm/mutter/mutter-44.4.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2023 Gentoo Authors
+# Copyright 1999-2024 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -164,7 +164,7 @@ src_configure() {
 		# - https://bugs.gentoo.org/835786
 		# - https://forums.gentoo.org/viewtopic-p-8695669.html
 
-		--buildtype $(usex debug debug plain)
+		-Dbuildtype=$(usex debug debug plain)
 		-Dopengl=true
 		$(meson_use wayland gles2)
 		#gles2_libname
diff --git a/x11-wm/mutter/mutter-45.1.ebuild b/x11-wm/mutter/mutter-45.1.ebuild
index 47520c00fe826..2001a87c20cf3 100644
--- a/x11-wm/mutter/mutter-45.1.ebuild
+++ b/x11-wm/mutter/mutter-45.1.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2023 Gentoo Authors
+# Copyright 1999-2024 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -162,7 +162,7 @@ src_configure() {
 		# - https://bugs.gentoo.org/835786
 		# - https://forums.gentoo.org/viewtopic-p-8695669.html
 
-		--buildtype $(usex debug debug plain)
+		-Dbuildtype=$(usex debug debug plain)
 		-Dopengl=true
 		$(meson_use wayland gles2)
 		#gles2_libname
diff --git a/x11-wm/mutter/mutter-45.2-r1.ebuild b/x11-wm/mutter/mutter-45.2-r1.ebuild
index 6c49d44d4b990..c91184e1b8335 100644
--- a/x11-wm/mutter/mutter-45.2-r1.ebuild
+++ b/x11-wm/mutter/mutter-45.2-r1.ebuild
@@ -166,7 +166,7 @@ src_configure() {
 		# - https://bugs.gentoo.org/835786
 		# - https://forums.gentoo.org/viewtopic-p-8695669.html
 
-		--buildtype $(usex debug debug plain)
+		-Dbuildtype=$(usex debug debug plain)
 		-Dopengl=true
 		$(meson_use wayland gles2)
 		#gles2_libname
diff --git a/x11-wm/mutter/mutter-45.2.ebuild b/x11-wm/mutter/mutter-45.2.ebuild
index 137933c8f503c..d0956f00c9240 100644
--- a/x11-wm/mutter/mutter-45.2.ebuild
+++ b/x11-wm/mutter/mutter-45.2.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2023 Gentoo Authors
+# Copyright 1999-2024 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -164,7 +164,7 @@ src_configure() {
 		# - https://bugs.gentoo.org/835786
 		# - https://forums.gentoo.org/viewtopic-p-8695669.html
 
-		--buildtype $(usex debug debug plain)
+		-Dbuildtype=$(usex debug debug plain)
 		-Dopengl=true
 		$(meson_use wayland gles2)
 		#gles2_libname
diff --git a/x11-wm/mutter/mutter-9999.ebuild b/x11-wm/mutter/mutter-9999.ebuild
index 47520c00fe826..2001a87c20cf3 100644
--- a/x11-wm/mutter/mutter-9999.ebuild
+++ b/x11-wm/mutter/mutter-9999.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2023 Gentoo Authors
+# Copyright 1999-2024 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -162,7 +162,7 @@ src_configure() {
 		# - https://bugs.gentoo.org/835786
 		# - https://forums.gentoo.org/viewtopic-p-8695669.html
 
-		--buildtype $(usex debug debug plain)
+		-Dbuildtype=$(usex debug debug plain)
 		-Dopengl=true
 		$(meson_use wayland gles2)
 		#gles2_libname