diff --git a/test/extensions/transport_sockets/tls/test_data/certs.sh b/test/extensions/transport_sockets/tls/test_data/certs.sh
index 2e2f300b4fa51..a19009d3acbe0 100755
--- a/test/extensions/transport_sockets/tls/test_data/certs.sh
+++ b/test/extensions/transport_sockets/tls/test_data/certs.sh
@@ -120,6 +120,13 @@ generate_cert_chain() {
         cat "i${x}_cert.pem" >> test_long_cert_chain.pem
     done
     mv i4_cert.pem test_random_cert.pem
+
+    # These intermediate files are unnecessary.
+    for x in {1..4}; do
+        rm -f "i${x}_key.pem"
+        rm -f "i${x}_cert.pem"
+        rm -f "i${x}_cert_info.h"
+    done
 }
 
 # Generate ca_cert.pem.