diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index ac3d150..83ccc4b 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -2234,7 +2234,7 @@
             }
         }
         /* Zero plus something non-zero : just return the something */
-        return make_float32(float32_val(c) ^ (signflip << 31));
+        return packFloat32(cSign ^ signflip, cExp, cSig);
     }
 
     if (aExp == 0) {
@@ -3787,7 +3787,7 @@
             }
         }
         /* Zero plus something non-zero : just return the something */
-        return make_float64(float64_val(c) ^ ((uint64_t)signflip << 63));
+        return packFloat64(cSign ^ signflip, cExp, cSig);
     }
 
     if (aExp == 0) {