diff --git a/Dockerfile-alpine.template b/Dockerfile-alpine.template
index 25400de7ab..3083680d18 100644
--- a/Dockerfile-alpine.template
+++ b/Dockerfile-alpine.template
@@ -19,12 +19,10 @@ RUN set -ex; \
 	docker-php-ext-install gd mysqli opcache; \
 	\
 	runDeps="$( \
-		scanelf --needed --nobanner --recursive \
-			/usr/local/lib/php/extensions \
-			| awk '{ gsub(/,/, "\nso:", $2); print "so:" $2 }' \
-			| sort -u \
-			| xargs -r apk info --installed \
+		scanelf --needed --nobanner --format '%n#p' --recursive /usr/local/lib/php/extensions \
+			| tr ',' '\n' \
 			| sort -u \
+			| awk 'system("[ -e /usr/local/lib/" $1 " ]") == 0 { next } { print "so:" $1 }' \
 	)"; \
 	apk add --virtual .wordpress-phpexts-rundeps $runDeps; \
 	apk del .build-deps
diff --git a/Dockerfile-cli.template b/Dockerfile-cli.template
index bb0392b31e..d3e8ea3fd9 100644
--- a/Dockerfile-cli.template
+++ b/Dockerfile-cli.template
@@ -12,12 +12,10 @@ RUN set -ex; \
 	docker-php-ext-install gd mysqli opcache; \
 	\
 	runDeps="$( \
-		scanelf --needed --nobanner --recursive \
-			/usr/local/lib/php/extensions \
-			| awk '{ gsub(/,/, "\nso:", $2); print "so:" $2 }' \
-			| sort -u \
-			| xargs -r apk info --installed \
+		scanelf --needed --nobanner --format '%n#p' --recursive /usr/local/lib/php/extensions \
+			| tr ',' '\n' \
 			| sort -u \
+			| awk 'system("[ -e /usr/local/lib/" $1 " ]") == 0 { next } { print "so:" $1 }' \
 	)"; \
 	apk add --virtual .wordpress-phpexts-rundeps $runDeps; \
 	apk del .build-deps
diff --git a/php5.6/cli/Dockerfile b/php5.6/cli/Dockerfile
index 867fdaf206..99c1eb6152 100644
--- a/php5.6/cli/Dockerfile
+++ b/php5.6/cli/Dockerfile
@@ -12,12 +12,10 @@ RUN set -ex; \
 	docker-php-ext-install gd mysqli opcache; \
 	\
 	runDeps="$( \
-		scanelf --needed --nobanner --recursive \
-			/usr/local/lib/php/extensions \
-			| awk '{ gsub(/,/, "\nso:", $2); print "so:" $2 }' \
-			| sort -u \
-			| xargs -r apk info --installed \
+		scanelf --needed --nobanner --format '%n#p' --recursive /usr/local/lib/php/extensions \
+			| tr ',' '\n' \
 			| sort -u \
+			| awk 'system("[ -e /usr/local/lib/" $1 " ]") == 0 { next } { print "so:" $1 }' \
 	)"; \
 	apk add --virtual .wordpress-phpexts-rundeps $runDeps; \
 	apk del .build-deps
diff --git a/php5.6/fpm-alpine/Dockerfile b/php5.6/fpm-alpine/Dockerfile
index c1fd08f209..3def1e644d 100644
--- a/php5.6/fpm-alpine/Dockerfile
+++ b/php5.6/fpm-alpine/Dockerfile
@@ -19,12 +19,10 @@ RUN set -ex; \
 	docker-php-ext-install gd mysqli opcache; \
 	\
 	runDeps="$( \
-		scanelf --needed --nobanner --recursive \
-			/usr/local/lib/php/extensions \
-			| awk '{ gsub(/,/, "\nso:", $2); print "so:" $2 }' \
-			| sort -u \
-			| xargs -r apk info --installed \
+		scanelf --needed --nobanner --format '%n#p' --recursive /usr/local/lib/php/extensions \
+			| tr ',' '\n' \
 			| sort -u \
+			| awk 'system("[ -e /usr/local/lib/" $1 " ]") == 0 { next } { print "so:" $1 }' \
 	)"; \
 	apk add --virtual .wordpress-phpexts-rundeps $runDeps; \
 	apk del .build-deps
diff --git a/php7.0/cli/Dockerfile b/php7.0/cli/Dockerfile
index 7893007b10..b90aa7bf1b 100644
--- a/php7.0/cli/Dockerfile
+++ b/php7.0/cli/Dockerfile
@@ -12,12 +12,10 @@ RUN set -ex; \
 	docker-php-ext-install gd mysqli opcache; \
 	\
 	runDeps="$( \
-		scanelf --needed --nobanner --recursive \
-			/usr/local/lib/php/extensions \
-			| awk '{ gsub(/,/, "\nso:", $2); print "so:" $2 }' \
-			| sort -u \
-			| xargs -r apk info --installed \
+		scanelf --needed --nobanner --format '%n#p' --recursive /usr/local/lib/php/extensions \
+			| tr ',' '\n' \
 			| sort -u \
+			| awk 'system("[ -e /usr/local/lib/" $1 " ]") == 0 { next } { print "so:" $1 }' \
 	)"; \
 	apk add --virtual .wordpress-phpexts-rundeps $runDeps; \
 	apk del .build-deps
diff --git a/php7.0/fpm-alpine/Dockerfile b/php7.0/fpm-alpine/Dockerfile
index 24e6ed30fc..4db8c808d2 100644
--- a/php7.0/fpm-alpine/Dockerfile
+++ b/php7.0/fpm-alpine/Dockerfile
@@ -19,12 +19,10 @@ RUN set -ex; \
 	docker-php-ext-install gd mysqli opcache; \
 	\
 	runDeps="$( \
-		scanelf --needed --nobanner --recursive \
-			/usr/local/lib/php/extensions \
-			| awk '{ gsub(/,/, "\nso:", $2); print "so:" $2 }' \
-			| sort -u \
-			| xargs -r apk info --installed \
+		scanelf --needed --nobanner --format '%n#p' --recursive /usr/local/lib/php/extensions \
+			| tr ',' '\n' \
 			| sort -u \
+			| awk 'system("[ -e /usr/local/lib/" $1 " ]") == 0 { next } { print "so:" $1 }' \
 	)"; \
 	apk add --virtual .wordpress-phpexts-rundeps $runDeps; \
 	apk del .build-deps
diff --git a/php7.1/cli/Dockerfile b/php7.1/cli/Dockerfile
index 5347a2aeae..92a073f33d 100644
--- a/php7.1/cli/Dockerfile
+++ b/php7.1/cli/Dockerfile
@@ -12,12 +12,10 @@ RUN set -ex; \
 	docker-php-ext-install gd mysqli opcache; \
 	\
 	runDeps="$( \
-		scanelf --needed --nobanner --recursive \
-			/usr/local/lib/php/extensions \
-			| awk '{ gsub(/,/, "\nso:", $2); print "so:" $2 }' \
-			| sort -u \
-			| xargs -r apk info --installed \
+		scanelf --needed --nobanner --format '%n#p' --recursive /usr/local/lib/php/extensions \
+			| tr ',' '\n' \
 			| sort -u \
+			| awk 'system("[ -e /usr/local/lib/" $1 " ]") == 0 { next } { print "so:" $1 }' \
 	)"; \
 	apk add --virtual .wordpress-phpexts-rundeps $runDeps; \
 	apk del .build-deps
diff --git a/php7.1/fpm-alpine/Dockerfile b/php7.1/fpm-alpine/Dockerfile
index e07b26554b..48dc9b21e9 100644
--- a/php7.1/fpm-alpine/Dockerfile
+++ b/php7.1/fpm-alpine/Dockerfile
@@ -19,12 +19,10 @@ RUN set -ex; \
 	docker-php-ext-install gd mysqli opcache; \
 	\
 	runDeps="$( \
-		scanelf --needed --nobanner --recursive \
-			/usr/local/lib/php/extensions \
-			| awk '{ gsub(/,/, "\nso:", $2); print "so:" $2 }' \
-			| sort -u \
-			| xargs -r apk info --installed \
+		scanelf --needed --nobanner --format '%n#p' --recursive /usr/local/lib/php/extensions \
+			| tr ',' '\n' \
 			| sort -u \
+			| awk 'system("[ -e /usr/local/lib/" $1 " ]") == 0 { next } { print "so:" $1 }' \
 	)"; \
 	apk add --virtual .wordpress-phpexts-rundeps $runDeps; \
 	apk del .build-deps