diff --git a/11/bookworm/Dockerfile b/11/bookworm/Dockerfile
index b0b53d519b..4406b7a246 100644
--- a/11/bookworm/Dockerfile
+++ b/11/bookworm/Dockerfile
@@ -55,8 +55,9 @@ RUN set -eux; \
 		! grep -q '/usr/share/locale' /etc/dpkg/dpkg.cfg.d/docker; \
 	fi; \
 	apt-get update; apt-get install -y --no-install-recommends locales; rm -rf /var/lib/apt/lists/*; \
-	echo en_US.UTF-8 UTF-8 >> /etc/locale.gen; \
-	locale-gen
+	echo 'en_US.UTF-8 UTF-8' >> /etc/locale.gen; \
+	locale-gen; \
+	locale -a | grep 'en_US.utf8'
 ENV LANG en_US.utf8
 
 RUN set -eux; \
diff --git a/11/bullseye/Dockerfile b/11/bullseye/Dockerfile
index 0de7a2e8b9..ce3e8bb562 100644
--- a/11/bullseye/Dockerfile
+++ b/11/bullseye/Dockerfile
@@ -55,8 +55,9 @@ RUN set -eux; \
 		! grep -q '/usr/share/locale' /etc/dpkg/dpkg.cfg.d/docker; \
 	fi; \
 	apt-get update; apt-get install -y --no-install-recommends locales; rm -rf /var/lib/apt/lists/*; \
-	echo en_US.UTF-8 UTF-8 >> /etc/locale.gen; \
-	locale-gen
+	echo 'en_US.UTF-8 UTF-8' >> /etc/locale.gen; \
+	locale-gen; \
+	locale -a | grep 'en_US.utf8'
 ENV LANG en_US.utf8
 
 RUN set -eux; \
diff --git a/12/bookworm/Dockerfile b/12/bookworm/Dockerfile
index 376ea147a0..165a9666bf 100644
--- a/12/bookworm/Dockerfile
+++ b/12/bookworm/Dockerfile
@@ -55,8 +55,9 @@ RUN set -eux; \
 		! grep -q '/usr/share/locale' /etc/dpkg/dpkg.cfg.d/docker; \
 	fi; \
 	apt-get update; apt-get install -y --no-install-recommends locales; rm -rf /var/lib/apt/lists/*; \
-	echo en_US.UTF-8 UTF-8 >> /etc/locale.gen; \
-	locale-gen
+	echo 'en_US.UTF-8 UTF-8' >> /etc/locale.gen; \
+	locale-gen; \
+	locale -a | grep 'en_US.utf8'
 ENV LANG en_US.utf8
 
 RUN set -eux; \
diff --git a/12/bullseye/Dockerfile b/12/bullseye/Dockerfile
index 354ee5e25c..6a6dd9ee59 100644
--- a/12/bullseye/Dockerfile
+++ b/12/bullseye/Dockerfile
@@ -55,8 +55,9 @@ RUN set -eux; \
 		! grep -q '/usr/share/locale' /etc/dpkg/dpkg.cfg.d/docker; \
 	fi; \
 	apt-get update; apt-get install -y --no-install-recommends locales; rm -rf /var/lib/apt/lists/*; \
-	echo en_US.UTF-8 UTF-8 >> /etc/locale.gen; \
-	locale-gen
+	echo 'en_US.UTF-8 UTF-8' >> /etc/locale.gen; \
+	locale-gen; \
+	locale -a | grep 'en_US.utf8'
 ENV LANG en_US.utf8
 
 RUN set -eux; \
diff --git a/13/bookworm/Dockerfile b/13/bookworm/Dockerfile
index c37ad7fc5f..d97ed4221c 100644
--- a/13/bookworm/Dockerfile
+++ b/13/bookworm/Dockerfile
@@ -55,8 +55,9 @@ RUN set -eux; \
 		! grep -q '/usr/share/locale' /etc/dpkg/dpkg.cfg.d/docker; \
 	fi; \
 	apt-get update; apt-get install -y --no-install-recommends locales; rm -rf /var/lib/apt/lists/*; \
-	echo en_US.UTF-8 UTF-8 >> /etc/locale.gen; \
-	locale-gen
+	echo 'en_US.UTF-8 UTF-8' >> /etc/locale.gen; \
+	locale-gen; \
+	locale -a | grep 'en_US.utf8'
 ENV LANG en_US.utf8
 
 RUN set -eux; \
diff --git a/13/bullseye/Dockerfile b/13/bullseye/Dockerfile
index 83f6d9fd84..d88766fc44 100644
--- a/13/bullseye/Dockerfile
+++ b/13/bullseye/Dockerfile
@@ -55,8 +55,9 @@ RUN set -eux; \
 		! grep -q '/usr/share/locale' /etc/dpkg/dpkg.cfg.d/docker; \
 	fi; \
 	apt-get update; apt-get install -y --no-install-recommends locales; rm -rf /var/lib/apt/lists/*; \
-	echo en_US.UTF-8 UTF-8 >> /etc/locale.gen; \
-	locale-gen
+	echo 'en_US.UTF-8 UTF-8' >> /etc/locale.gen; \
+	locale-gen; \
+	locale -a | grep 'en_US.utf8'
 ENV LANG en_US.utf8
 
 RUN set -eux; \
diff --git a/14/bookworm/Dockerfile b/14/bookworm/Dockerfile
index 1eb9c3eeb9..e99b2427b9 100644
--- a/14/bookworm/Dockerfile
+++ b/14/bookworm/Dockerfile
@@ -55,8 +55,9 @@ RUN set -eux; \
 		! grep -q '/usr/share/locale' /etc/dpkg/dpkg.cfg.d/docker; \
 	fi; \
 	apt-get update; apt-get install -y --no-install-recommends locales; rm -rf /var/lib/apt/lists/*; \
-	echo en_US.UTF-8 UTF-8 >> /etc/locale.gen; \
-	locale-gen
+	echo 'en_US.UTF-8 UTF-8' >> /etc/locale.gen; \
+	locale-gen; \
+	locale -a | grep 'en_US.utf8'
 ENV LANG en_US.utf8
 
 RUN set -eux; \
diff --git a/14/bullseye/Dockerfile b/14/bullseye/Dockerfile
index 401e823764..d8d3461190 100644
--- a/14/bullseye/Dockerfile
+++ b/14/bullseye/Dockerfile
@@ -55,8 +55,9 @@ RUN set -eux; \
 		! grep -q '/usr/share/locale' /etc/dpkg/dpkg.cfg.d/docker; \
 	fi; \
 	apt-get update; apt-get install -y --no-install-recommends locales; rm -rf /var/lib/apt/lists/*; \
-	echo en_US.UTF-8 UTF-8 >> /etc/locale.gen; \
-	locale-gen
+	echo 'en_US.UTF-8 UTF-8' >> /etc/locale.gen; \
+	locale-gen; \
+	locale -a | grep 'en_US.utf8'
 ENV LANG en_US.utf8
 
 RUN set -eux; \
diff --git a/15/bookworm/Dockerfile b/15/bookworm/Dockerfile
index 60741cddbd..e51062e703 100644
--- a/15/bookworm/Dockerfile
+++ b/15/bookworm/Dockerfile
@@ -55,8 +55,9 @@ RUN set -eux; \
 		! grep -q '/usr/share/locale' /etc/dpkg/dpkg.cfg.d/docker; \
 	fi; \
 	apt-get update; apt-get install -y --no-install-recommends locales; rm -rf /var/lib/apt/lists/*; \
-	echo en_US.UTF-8 UTF-8 >> /etc/locale.gen; \
-	locale-gen
+	echo 'en_US.UTF-8 UTF-8' >> /etc/locale.gen; \
+	locale-gen; \
+	locale -a | grep 'en_US.utf8'
 ENV LANG en_US.utf8
 
 RUN set -eux; \
diff --git a/15/bullseye/Dockerfile b/15/bullseye/Dockerfile
index 1b5ca69a65..2bde90139d 100644
--- a/15/bullseye/Dockerfile
+++ b/15/bullseye/Dockerfile
@@ -55,8 +55,9 @@ RUN set -eux; \
 		! grep -q '/usr/share/locale' /etc/dpkg/dpkg.cfg.d/docker; \
 	fi; \
 	apt-get update; apt-get install -y --no-install-recommends locales; rm -rf /var/lib/apt/lists/*; \
-	echo en_US.UTF-8 UTF-8 >> /etc/locale.gen; \
-	locale-gen
+	echo 'en_US.UTF-8 UTF-8' >> /etc/locale.gen; \
+	locale-gen; \
+	locale -a | grep 'en_US.utf8'
 ENV LANG en_US.utf8
 
 RUN set -eux; \
diff --git a/16/bookworm/Dockerfile b/16/bookworm/Dockerfile
index 359a948d40..684c6ee36a 100644
--- a/16/bookworm/Dockerfile
+++ b/16/bookworm/Dockerfile
@@ -55,8 +55,9 @@ RUN set -eux; \
 		! grep -q '/usr/share/locale' /etc/dpkg/dpkg.cfg.d/docker; \
 	fi; \
 	apt-get update; apt-get install -y --no-install-recommends locales; rm -rf /var/lib/apt/lists/*; \
-	echo en_US.UTF-8 UTF-8 >> /etc/locale.gen; \
-	locale-gen
+	echo 'en_US.UTF-8 UTF-8' >> /etc/locale.gen; \
+	locale-gen; \
+	locale -a | grep 'en_US.utf8'
 ENV LANG en_US.utf8
 
 RUN set -eux; \
diff --git a/16/bullseye/Dockerfile b/16/bullseye/Dockerfile
index a906a74505..ecc31fc106 100644
--- a/16/bullseye/Dockerfile
+++ b/16/bullseye/Dockerfile
@@ -55,8 +55,9 @@ RUN set -eux; \
 		! grep -q '/usr/share/locale' /etc/dpkg/dpkg.cfg.d/docker; \
 	fi; \
 	apt-get update; apt-get install -y --no-install-recommends locales; rm -rf /var/lib/apt/lists/*; \
-	echo en_US.UTF-8 UTF-8 >> /etc/locale.gen; \
-	locale-gen
+	echo 'en_US.UTF-8 UTF-8' >> /etc/locale.gen; \
+	locale-gen; \
+	locale -a | grep 'en_US.utf8'
 ENV LANG en_US.utf8
 
 RUN set -eux; \
diff --git a/Dockerfile-debian.template b/Dockerfile-debian.template
index 1dced5e469..3d1884be00 100644
--- a/Dockerfile-debian.template
+++ b/Dockerfile-debian.template
@@ -49,8 +49,9 @@ RUN set -eux; \
 		! grep -q '/usr/share/locale' /etc/dpkg/dpkg.cfg.d/docker; \
 	fi; \
 	apt-get update; apt-get install -y --no-install-recommends locales; rm -rf /var/lib/apt/lists/*; \
-	echo en_US.UTF-8 UTF-8 >> /etc/locale.gen; \
-	locale-gen
+	echo 'en_US.UTF-8 UTF-8' >> /etc/locale.gen; \
+	locale-gen; \
+	locale -a | grep 'en_US.utf8'
 ENV LANG en_US.utf8
 
 RUN set -eux; \