diff --git a/reactos/lib/sdk/libcntpr/math/i386/trig_asm.s b/reactos/lib/sdk/libcntpr/math/i386/trig_asm.s
index cde51b0d235..734377d84f9 100644
--- a/reactos/lib/sdk/libcntpr/math/i386/trig_asm.s
+++ b/reactos/lib/sdk/libcntpr/math/i386/trig_asm.s
@@ -9,6 +9,7 @@
 .globl _atan
 .globl _cos
 .globl _sin
+.globl _tan
  
 .intel_syntax noprefix