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-rw-r--r--lib/cmath.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/cmath.rb b/lib/cmath.rb
index 5b261ed6a8..31c5a59c99 100644
--- a/lib/cmath.rb
+++ b/lib/cmath.rb
@@ -47,7 +47,7 @@ module CMath
end
def log10(z)
- if z.real?
+ if z.real? and z >= 0
log10!(z)
else
log(z) / log!(10)