diff --git a/Source/Particles/Collision/BinaryCollision/Coulomb/ElasticCollisionPerez.H b/Source/Particles/Collision/BinaryCollision/Coulomb/ElasticCollisionPerez.H
index e407ae1603b..af4e6ba38c9 100644
--- a/Source/Particles/Collision/BinaryCollision/Coulomb/ElasticCollisionPerez.H
+++ b/Source/Particles/Collision/BinaryCollision/Coulomb/ElasticCollisionPerez.H
@@ -58,7 +58,7 @@ void ElasticCollisionPerez (
     const T_index NI1 = I1e - I1s;
     const T_index NI2 = I2e - I2s;
     const T_index max_N = amrex::max(NI1,NI2);
-    const T_index min_N = amrex::max(NI1,NI2);
+    const T_index min_N = amrex::min(NI1,NI2);
 
     T_PR * const AMREX_RESTRICT w1 = soa_1.m_rdata[PIdx::w];
     T_PR * const AMREX_RESTRICT u1x = soa_1.m_rdata[PIdx::ux];