diff --git a/src/__private__/__is_float.scad b/src/__private__/__is_float.scad
index f5889769..b94df541 100644
--- a/src/__private__/__is_float.scad
+++ b/src/__private__/__is_float.scad
@@ -1 +1 @@
-function __is_float(value) = value + 0 != undef;
\ No newline at end of file
+function __is_float(value) = is_num(value);
\ No newline at end of file