diff --git a/lib/libm/math.c b/lib/libm/math.c
index 8433081b97..23218fe56b 100644
--- a/lib/libm/math.c
+++ b/lib/libm/math.c
@@ -116,6 +116,7 @@ float tanhf(float x) { return sinhf(x) / coshf(x); }
 float acoshf(float x) { return 0.0; }
 float asinhf(float x) { return 0.0; }
 float atanhf(float x) { return 0.0; }
+float tanf(float x) { return 0.0; }
 float acosf(float x) { return 0.0; }
 float asinf(float x) { return 0.0; }
 float fmodf(float x, float y) { return 0.0; }