diff --git a/reactos/lib/crt/crt.rbuild b/reactos/lib/crt/crt.rbuild
index c12c110cf71..01667c651f5 100644
--- a/reactos/lib/crt/crt.rbuild
+++ b/reactos/lib/crt/crt.rbuild
@@ -119,6 +119,7 @@
 		<file>jn_yn.c</file>
 		<file>ldexp.c</file>
 		<file>log10.c</file>
+            <file>modf.c</file>
 		<file>s_modf.c</file>
 		<file>pow.c</file>
 		<file>sinh.c</file>