diff --git a/tests/dnn/dnn-layer-mathunary-test.c b/tests/dnn/dnn-layer-mathunary-test.c
index 23e1766ad0..9a7e07c98c 100644
--- a/tests/dnn/dnn-layer-mathunary-test.c
+++ b/tests/dnn/dnn-layer-mathunary-test.c
@@ -36,6 +36,8 @@ static float get_expected(float f, DNNMathUnaryOperation op)
         return sin(f);
     case DMUO_COS:
         return cos(f);
+    case DMUO_TAN:
+        return tan(f);
     default:
         av_assert0(!"not supported yet");
         return 0.f;
@@ -85,5 +87,7 @@ int main(int agrc, char **argv)
         return 1;
     if (test(DMUO_COS))
         return 1;
+    if (test(DMUO_TAN))
+        return 1;
     return 0;
 }