diff --git a/lib/system/sysstr.nim b/lib/system/sysstr.nim
index 64d6634d26..50adca4801 100644
--- a/lib/system/sysstr.nim
+++ b/lib/system/sysstr.nim
@@ -356,11 +356,6 @@ proc nimParseBiggestFloat(s: string, number: var BiggestFloat,
           return i+3 - start
     return 0
 
-  # Skip leading zero
-  while s[i] == '0':
-    inc(i)
-    while s[i] == '_': inc(i)
-
   if s[i] in {'0'..'9'}:
       first_digit = (s[i].ord - '0'.ord)
   # Integer part?
diff --git a/tests/float/tfloat4.nim b/tests/float/tfloat4.nim
index 960c4e5f71..9bc8cfffff 100644
--- a/tests/float/tfloat4.nim
+++ b/tests/float/tfloat4.nim
@@ -13,7 +13,7 @@ proc floatToStr(f: float64): string =
 
 let testFloats = [
   "0", "-1", "1", "1.", ".3", "3.3", "-.3", "-99.99",
-  "1.1e10", "-2e100", "1.234e-10", "1.234e+10",
+  "1.1e10", "-2e100", "1.234e-10", "1.234e+10", "-0.0",
   "-inf", "inf", "+inf",
   "3.14159265358979323846264338327950288",
   "1.57079632679489661923132169163975144",