diff --git a/src/system/libroot/posix/math/floatmath.c b/src/system/libroot/posix/math/floatmath.c
index eaaa91b6fb..29b5028c8f 100644
--- a/src/system/libroot/posix/math/floatmath.c
+++ b/src/system/libroot/posix/math/floatmath.c
@@ -116,3 +116,10 @@ __fpclassifyl(long double value)
 	// TODO: implement me!
 	return FP_NORMAL;
 }
+
+int
+finitef(float value)
+{
+	int clazz = __fpclassifyf(value);
+	return (clazz == FP_ZERO || clazz == FP_SUBNORMAL || clazz == FP_NORMAL);
+}