diff --git a/example/std_example.rs b/example/std_example.rs
index 1337c314766..c0f236055ab 100644
--- a/example/std_example.rs
+++ b/example/std_example.rs
@@ -36,6 +36,7 @@ fn main() {
     println!("{}", 2.3f32.min(1.0));
     println!("{}", 2.3f32.max(1.0));
     println!("{}", 2.3f32.powi(2));
+    println!("{}", 2.3f32.log2());
 
     assert_eq!(0b0000000000000000000000000010000010000000000000000000000000000000_0000000000100000000000000000000000001000000000000100000000000000u128.leading_zeros(), 26);
     assert_eq!(0b0000000000000000000000000010000000000000000000000000000000000000_0000000000000000000000000000000000001000000000000000000010000000u128.trailing_zeros(), 7);
diff --git a/src/intrinsics.rs b/src/intrinsics.rs
index 5beabfb5ee2..7754e34eb1f 100644
--- a/src/intrinsics.rs
+++ b/src/intrinsics.rs
@@ -317,6 +317,8 @@ pub fn codegen_intrinsic_call<'a, 'tcx: 'a>(
         powif64(a, x) -> f64 => __powidf2, // compiler-builtins
         logf32(flt) -> f32 => logf,
         logf64(flt) -> f64 => log,
+        log2f32(flt) -> f32 => log2f,
+        log2f64(flt) -> f64 => log2,
         fabsf32(flt) -> f32 => fabsf,
         fabsf64(flt) -> f64 => fabs,
         fmaf32(x, y, z) -> f32 => fmaf,