diff --git a/src/types.c b/src/types.c
index e3f3d11..0ecf80e 100644
--- a/src/types.c
+++ b/src/types.c
@@ -194,7 +194,7 @@ static PUREFUNC INLINE double type_min_magnitude(type_t *t)
         }
     }
     case NumType: return -1./0.;
-    default: return NAN;
+    default: return (double)NAN;
     }
 }
 
@@ -214,7 +214,7 @@ static PUREFUNC INLINE double type_max_magnitude(type_t *t)
         }
     }
     case NumType: return 1./0.;
-    default: return NAN;
+    default: return (double)NAN;
     }
 }