diff --git a/clippy_lints/src/consts.rs b/clippy_lints/src/consts.rs
index d4ee76590561..9ed37e70a01d 100644
--- a/clippy_lints/src/consts.rs
+++ b/clippy_lints/src/consts.rs
@@ -92,8 +92,10 @@ impl PartialEq for Constant {
                 // we want `Fw32 == FwAny` and `FwAny == Fw64`, by transitivity we must have
                 // `Fw32 == Fw64` so don’t compare them
                 match (ls.parse::<f64>(), rs.parse::<f64>()) {
-                    (Ok(l), Ok(r)) => l.eq(&r) &&
-                        (l.is_sign_positive() == r.is_sign_positive()), // needed for 0.0 != -0.0
+                    // mem::transmute is required to catch non-matching 0.0, -0.0, and NaNs
+                    (Ok(l), Ok(r)) => unsafe {
+                        mem::transmute::<f64, u64>(l) == mem::transmute::<f64, u64>(r)
+                    },
                     _ => false,
                 }
             }