diff --git a/nnef/src/registry.rs b/nnef/src/registry.rs
index e30b189bbc..3f1fcea42a 100644
--- a/nnef/src/registry.rs
+++ b/nnef/src/registry.rs
@@ -219,15 +219,19 @@ impl Registry {
 
             // mitigation of nnef "scalar" type mismatch with tract-core more
             // strict types
-            if (!a_dt.is_quantized() || !b_dt.is_quantized()) && a_dt != b_dt {
-                if builder.model.node(a.node).op_is::<tract_core::ops::konst::Const>() {
-                    a = builder.wire_as_outlets(tract_core::ops::cast::cast(b_dt), &[a])?[0];
-                    a_dt = b_dt;
-                } else {
-                    b = builder.wire_as_outlets(tract_core::ops::cast::cast(a_dt), &[b])?[0];
-                    b_dt = a_dt;
-                };
+            if !a_dt.is_quantized() || !b_dt.is_quantized() {
+                if a_dt != b_dt {
+                    if builder.model.node(a.node).op_is::<tract_core::ops::konst::Const>() {
+                        a = builder.wire_as_outlets(tract_core::ops::cast::cast(b_dt), &[a])?[0];
+                        a_dt = b_dt;
+                    } else {
+                        b = builder.wire_as_outlets(tract_core::ops::cast::cast(a_dt), &[b])?[0];
+                        b_dt = a_dt;
+                    }
+                }
                 let operating_dt = bin.1.operating_datum_type(a_dt, b_dt)?;
+                // avoid cast unified dtype to happen when all inputs quantized
+                // that can be unaligned at process time
                 a = builder.wire_as_outlets(tract_core::ops::cast::cast(operating_dt), &[a])?[0];
                 b = builder.wire_as_outlets(tract_core::ops::cast::cast(operating_dt), &[b])?[0];
             }