diff --git a/lib/altsvc.c b/lib/altsvc.c
index bd87af1c87..2ccd22ef47 100644
--- a/lib/altsvc.c
+++ b/lib/altsvc.c
@@ -665,4 +665,8 @@ bool Curl_altsvc_lookup(struct altsvcinfo *asi,
   return FALSE;
 }
 
+#if defined(DEBUGBUILD) || defined(UNITTESTS)
+#undef time
+#endif
+
 #endif /* !CURL_DISABLE_HTTP && !CURL_DISABLE_ALTSVC */
diff --git a/lib/hsts.c b/lib/hsts.c
index cba218153a..91f32276f9 100644
--- a/lib/hsts.c
+++ b/lib/hsts.c
@@ -580,4 +580,8 @@ void Curl_hsts_loadfiles(struct Curl_easy *data)
   }
 }
 
+#if defined(DEBUGBUILD) || defined(UNITTESTS)
+#undef time
+#endif
+
 #endif /* CURL_DISABLE_HTTP || CURL_DISABLE_HSTS */