diff --git a/benchmarks/tof/scripts/gen_tof_hits.cxx b/benchmarks/tof/scripts/gen_tof_hits.cxx
index aedb0eb268c9ee9d51dc7a8b32ceab7d92c18c10..e844bc2b999a6683bc49080e99e7e21a23e56179 100644
--- a/benchmarks/tof/scripts/gen_tof_hits.cxx
+++ b/benchmarks/tof/scripts/gen_tof_hits.cxx
@@ -35,7 +35,7 @@ void gen_tof_hits(int n_events = 100,
     // pdgid 111 - pi0
     // pdgid 2212 - proton
     Double_t p     = r1->Uniform(0, 3.5);
-    Double_t costh = -1*cos(90.001/180*3.1415926); //r1->Uniform(cos_theta_min, cos_theta_max);
+    Double_t costh = -1*cos(89.999/180*3.1415926); //r1->Uniform(cos_theta_min, cos_theta_max);
     Double_t th    = std::acos(costh);
     Double_t phi   = r1->Uniform(0.0, 2.0 * M_PI);
     Double_t px    = p * std::cos(phi) * std::sin(th);