diff --git a/actix-files/CHANGES.md b/actix-files/CHANGES.md
index 6b4ab57b..e8457f42 100644
--- a/actix-files/CHANGES.md
+++ b/actix-files/CHANGES.md
@@ -1,5 +1,10 @@
 # Changes
 
+## [0.1.0] - 2019-05-xx
+
+* NamedFile last-modified check always fails due to nano-seconds
+  in file modified date #820
+
 ## [0.1.0-beta.4] - 2019-05-12
 
 * Update actix-web to beta.4
diff --git a/actix-files/src/named.rs b/actix-files/src/named.rs
index 41a7cf1f..2298e35a 100644
--- a/actix-files/src/named.rs
+++ b/actix-files/src/named.rs
@@ -337,7 +337,12 @@ impl Responder for NamedFile {
         } else if let (Some(ref m), Some(header::IfUnmodifiedSince(ref since))) =
             (last_modified, req.get_header())
         {
-            m > since
+            let t1: SystemTime = m.clone().into();
+            let t2: SystemTime = since.clone().into();
+            match (t1.duration_since(UNIX_EPOCH), t2.duration_since(UNIX_EPOCH)) {
+                (Ok(t1), Ok(t2)) => t1 > t2,
+                _ => false,
+            }
         } else {
             false
         };
@@ -350,7 +355,12 @@ impl Responder for NamedFile {
         } else if let (Some(ref m), Some(header::IfModifiedSince(ref since))) =
             (last_modified, req.get_header())
         {
-            m <= since
+            let t1: SystemTime = m.clone().into();
+            let t2: SystemTime = since.clone().into();
+            match (t1.duration_since(UNIX_EPOCH), t2.duration_since(UNIX_EPOCH)) {
+                (Ok(t1), Ok(t2)) => t1 <= t2,
+                _ => false,
+            }
         } else {
             false
         };