diff --git a/install-php-extensions b/install-php-extensions
index a5eb3ed..3062bab 100755
--- a/install-php-extensions
+++ b/install-php-extensions
@@ -308,6 +308,7 @@ buildRequiredPackageLists() {
 				buildRequiredPackageLists_volatile="$buildRequiredPackageLists_volatile icu-dev"
 				;;
 			intl@debian)
+				buildRequiredPackageLists_persistent="$buildRequiredPackageLists_persistent libicu[0-9]+$"
 				buildRequiredPackageLists_volatile="$buildRequiredPackageLists_volatile libicu-dev"
 				;;
 			ldap@alpine)