diff --git a/scripts/build/build_libpq.sh b/scripts/build/build_libpq.sh
index 107460f8..91c04375 100755
--- a/scripts/build/build_libpq.sh
+++ b/scripts/build/build_libpq.sh
@@ -40,11 +40,20 @@ case "$(uname)" in
         ;;
 esac
 
+# Install packages required for test and wheels build, regardless of whether
+# we will build the libpq or not.
+case "$ID" in
+    alpine)
+        apk add --no-cache krb5-libs
+        ;;
+esac
+
 if [[ -f "${LIBPQ_BUILD_PREFIX}/lib/libpq.${library_suffix}" ]]; then
     echo "libpq already available: build skipped" >&2
     exit 0
 fi
 
+# Install packages required to build the libpq.
 case "$ID" in
     centos)
         yum update -y