diff --git a/reactos/lib/crt/math/i386/tan_asm.s b/reactos/lib/crt/math/i386/tan_asm.s
new file mode 100644
index 00000000000..5d6ed98c839
--- /dev/null
+++ b/reactos/lib/crt/math/i386/tan_asm.s
@@ -0,0 +1,53 @@
+/*
+ * COPYRIGHT:         See COPYING in the top level directory
+ * PROJECT:           ReactOS kernel
+ * PURPOSE:           Run-Time Library
+ * FILE:              lib/rtl/i386/tan.S
+ * PROGRAMER:         Alex Ionescu (alex@relsoft.net)
+ *                    Eric Kohl (ekohl@rz-online.de)
+ *
+ * Copyright (C) 2002 Michael Ringgaard.
+ * All rights reserved. 
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 
+ * 1. Redistributions of source code must retain the above copyright 
+ *    notice, this list of conditions and the following disclaimer.  
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.  
+ * 3. Neither the name of the project nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission. 
+
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES// LOSS OF USE, DATA, OR PROFITS// OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
+ * SUCH DAMAGE.
+ */
+ 
+.globl _tan
+ 
+.intel_syntax noprefix
+
+/* FUNCTIONS ***************************************************************/
+
+_tan:
+        push    ebp
+        mov     ebp,esp
+        sub     esp,4                   // Allocate temporary space
+        fld     qword ptr [ebp+8]       // Load real from stack
+        fptan                           // Take the tangent
+        fstp    dword ptr [ebp-4]       // Throw away the constant 1
+        mov     esp,ebp                 // Deallocate temporary space
+        pop     ebp
+        ret