diff --git a/sprout/math/isfinite.hpp b/sprout/math/isfinite.hpp
index 8f70cf46..c80317df 100644
--- a/sprout/math/isfinite.hpp
+++ b/sprout/math/isfinite.hpp
@@ -48,7 +48,7 @@ namespace sprout {
 			typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler
 		>
 		inline SPROUT_CONSTEXPR bool
-		isfinite(IntType x) {
+		isfinite(IntType) {
 			return true;
 		}
 	}	// namespace math
diff --git a/sprout/math/isinf.hpp b/sprout/math/isinf.hpp
index 39092966..4b72b072 100644
--- a/sprout/math/isinf.hpp
+++ b/sprout/math/isinf.hpp
@@ -48,7 +48,7 @@ namespace sprout {
 			typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler
 		>
 		inline SPROUT_CONSTEXPR bool
-		isinf(IntType x) {
+		isinf(IntType) {
 			return false;
 		}
 	}	// namespace math
diff --git a/sprout/math/isnan.hpp b/sprout/math/isnan.hpp
index e58ab5ae..30ac9ffb 100644
--- a/sprout/math/isnan.hpp
+++ b/sprout/math/isnan.hpp
@@ -46,7 +46,7 @@ namespace sprout {
 			typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler
 		>
 		inline SPROUT_CONSTEXPR bool
-		isnan(IntType x) {
+		isnan(IntType) {
 			return false;
 		}
 	}	// namespace math