diff --git a/.gitignore b/.gitignore
index 3a0d8ae..3f2cb01 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 *.o
 *.bundle
+Makefile
diff --git a/rb_fraction.m b/rb_fraction.m
index 167bb7a..f3410cf 100644
--- a/rb_fraction.m
+++ b/rb_fraction.m
@@ -50,12 +50,12 @@ void fraction_free(Fraction *fraction) {
 }
 
 VALUE fraction_allocate(VALUE klass) {
-  Fraction *fraction = [[Fraction alloc] init];
+  frac = [[Fraction alloc] init];
 
-  [fraction setDenominator:Qnil];
-  [fraction setNumerator:Qnil];
+  [frac setDenominator:Qnil];
+  [frac setNumerator:Qnil];
 
-  return Data_Wrap_Struct(klass, fraction_mark, fraction_free, fraction);
+  return Data_Wrap_Struct(klass, fraction_mark, fraction_free, frac);
 }
 
 VALUE fraction_initialize(VALUE self) {