diff --git a/src/de.rs b/src/de.rs
index bd4ead0..d5af272 100644
--- a/src/de.rs
+++ b/src/de.rs
@@ -893,6 +893,12 @@ impl<'a> Deserializer<'a> {
         }
         number.parse().map_err(|_e| {
             self.error(start, ErrorKind::NumberInvalid)
+        }).and_then(|n: f64| {
+            if n.is_finite() {
+                Ok(n)
+            } else {
+                Err(self.error(start, ErrorKind::NumberInvalid))
+            }
         })
     }
 
diff --git a/tests/invalid-misc.rs b/tests/invalid-misc.rs
index 53f625e..bb70b97 100644
--- a/tests/invalid-misc.rs
+++ b/tests/invalid-misc.rs
@@ -10,4 +10,8 @@ fn bad() {
     bad("a = 1__1");
     bad("a = 1_");
     bad("''");
+    bad("a = nan");
+    bad("a = -inf");
+    bad("a = inf");
+    bad("a = 9e99999");
 }