diff --git a/Cargo.toml b/Cargo.toml
index d50339be..c840c3cd 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -27,6 +27,7 @@ matches = "0.1"
 phf = {version = "0.8", features = ["macros"]}
 serde = {version = "1.0", optional = true}
 smallvec = "1.0"
+libm = "0.2"
 
 [build-dependencies]
 syn = { version = "1", features = ["extra-traits", "fold", "full"] }
diff --git a/src/tokenizer.rs b/src/tokenizer.rs
index 62f38683..2b8a79e3 100644
--- a/src/tokenizer.rs
+++ b/src/tokenizer.rs
@@ -11,6 +11,7 @@ use matches::matches;
 use std::char;
 use std::i32;
 use std::ops::Range;
+use libm;
 
 /// One of the pieces the CSS input is broken into.
 ///
@@ -1073,7 +1074,7 @@ fn consume_numeric<'a>(tokenizer: &mut Tokenizer<'a>) -> Token<'a> {
                     break;
                 }
             }
-            value *= f64::powf(10., sign * exponent);
+            value *= libm::pow(10., sign * exponent);
         }
     }