diff --git a/src/eos/private/helm.cpp b/src/eos/private/helm.cpp
index efed85f..99c8cdb 100644
--- a/src/eos/private/helm.cpp
+++ b/src/eos/private/helm.cpp
@@ -355,8 +355,8 @@ namespace serif::eos::helmholtz {
     // hash the table location in t, rho:
     jat = (log10(T) - tlo)*tstpi;
     jat = max(0, min(jat, table.jmax-1)); // bounds
-    iat = max(0, min(iat, table.imax-1)); // bounds
     iat = (log10(din)-dlo)*dstpi;
+    iat = max(0, min(iat, table.imax-1)); // bounds
 
     //using the indices, access the table:
     fi[0]  = table.f[iat][jat];