diff --git a/dev-lang/ghc/ghc-9.0.2-r4.ebuild b/dev-lang/ghc/ghc-9.0.2-r4.ebuild
index 68814a7247531..7f042af3615b7 100644
--- a/dev-lang/ghc/ghc-9.0.2-r4.ebuild
+++ b/dev-lang/ghc/ghc-9.0.2-r4.ebuild
@@ -491,10 +491,10 @@ src_unpack() {
 }
 
 src_prepare() {
-	# Force the use of C.utf8 locale
+	# Force the use of C.UTF-8 locale
 	# <https://github.com/gentoo-haskell/gentoo-haskell/issues/1287>
 	# <https://github.com/gentoo-haskell/gentoo-haskell/issues/1289>
-	export LC_ALL=C.utf8
+	export LC_ALL=C.UTF-8
 
 	ghc_setup_cflags
 
diff --git a/dev-lang/ghc/ghc-9.2.8.ebuild b/dev-lang/ghc/ghc-9.2.8.ebuild
index f07bb98c69b41..92a5cd3b8c4a3 100644
--- a/dev-lang/ghc/ghc-9.2.8.ebuild
+++ b/dev-lang/ghc/ghc-9.2.8.ebuild
@@ -532,10 +532,10 @@ src_unpack() {
 }
 
 src_prepare() {
-	# Force the use of C.utf8 locale
+	# Force the use of C.UTF-8 locale
 	# <https://github.com/gentoo-haskell/gentoo-haskell/issues/1287>
 	# <https://github.com/gentoo-haskell/gentoo-haskell/issues/1289>
-	export LC_ALL=C.utf8
+	export LC_ALL=C.UTF-8
 
 	if use binary; then
 		local bin_pv="${BIN_PV}"