diff --git a/src/math/round.rs b/src/math/round.rs
index efbe68a..67590d2 100644
--- a/src/math/round.rs
+++ b/src/math/round.rs
@@ -36,7 +36,12 @@ pub fn round(mut x: f64) -> f64 {
     }
 }
 
-#[test]
-fn negative_zero() {
-    assert_eq!(round(-0.0_f64).to_bits(), (-0.0_f64).to_bits());
+#[cfg(test)]
+mod tests {
+    use super::round;
+
+    #[test]
+    fn negative_zero() {
+        assert_eq!(round(-0.0_f64).to_bits(), (-0.0_f64).to_bits());
+    }
 }
diff --git a/src/math/roundf.rs b/src/math/roundf.rs
index 559d3a9..85114be 100644
--- a/src/math/roundf.rs
+++ b/src/math/roundf.rs
@@ -34,7 +34,12 @@ pub fn roundf(mut x: f32) -> f32 {
     }
 }
 
-#[test]
-fn negative_zero() {
-    assert_eq!(roundf(-0.0_f32).to_bits(), (-0.0_f32).to_bits());
+#[cfg(test)]
+mod tests {
+    use super::roundf;
+
+    #[test]
+    fn negative_zero() {
+        assert_eq!(roundf(-0.0_f32).to_bits(), (-0.0_f32).to_bits());
+    }
 }