diff --git a/dev-libs/glib/glib-2.76.4.ebuild b/dev-libs/glib/glib-2.76.4.ebuild
index 7e94c72d6e032..51da7bfa347fb 100644
--- a/dev-libs/glib/glib-2.76.4.ebuild
+++ b/dev-libs/glib/glib-2.76.4.ebuild
@@ -179,7 +179,7 @@ multilib_src_configure() {
 	#fi
 
 	local emesonargs=(
-		--buildtype $(usex debug debug plain)
+		-Dbuildtype=$(usex debug debug plain)
 		-Ddefault_library=$(usex static-libs both shared)
 		-Druntime_dir="${EPREFIX}"/run
 		$(meson_feature selinux)
diff --git a/dev-libs/glib/glib-2.78.3.ebuild b/dev-libs/glib/glib-2.78.3.ebuild
index 7e94c72d6e032..51da7bfa347fb 100644
--- a/dev-libs/glib/glib-2.78.3.ebuild
+++ b/dev-libs/glib/glib-2.78.3.ebuild
@@ -179,7 +179,7 @@ multilib_src_configure() {
 	#fi
 
 	local emesonargs=(
-		--buildtype $(usex debug debug plain)
+		-Dbuildtype=$(usex debug debug plain)
 		-Ddefault_library=$(usex static-libs both shared)
 		-Druntime_dir="${EPREFIX}"/run
 		$(meson_feature selinux)
diff --git a/dev-libs/glib/glib-2.78.4-r1.ebuild b/dev-libs/glib/glib-2.78.4-r1.ebuild
index ec81f416256da..a6f0241faaa92 100644
--- a/dev-libs/glib/glib-2.78.4-r1.ebuild
+++ b/dev-libs/glib/glib-2.78.4-r1.ebuild
@@ -187,7 +187,7 @@ multilib_src_configure() {
 	#fi
 
 	local emesonargs=(
-		--buildtype $(usex debug debug plain)
+		-Dbuildtype=$(usex debug debug plain)
 		-Ddefault_library=$(usex static-libs both shared)
 		-Druntime_dir="${EPREFIX}"/run
 		$(meson_feature selinux)