diff --git a/Headers/Foundation/NSUnit.h b/Headers/Foundation/NSUnit.h
index 8d83e85d5..f5d80a972 100644
--- a/Headers/Foundation/NSUnit.h
+++ b/Headers/Foundation/NSUnit.h
@@ -132,7 +132,7 @@ extern "C" {
 + (NSUnitConcentrationMass *) gramsPerLiter;
 + (NSUnitConcentrationMass *) milligramsPerDeciliter;
 
-+ (NSUnitConcentrationMass *) millimolesPerLiterWithGramsPerMole:(double)gramsPerMole;
++ (NSUnitConcentrationMass *) millimolesPerLiterWithGramsPerMole: (double)gramsPerMole;
 
 @end