diff --git a/gnark/src/main/java/org/hyperledger/besu/nativelib/gnark/LibGnarkEIP2537.java b/gnark/src/main/java/org/hyperledger/besu/nativelib/gnark/LibGnarkEIP2537.java
index 176ce8e3..4ea6c489 100644
--- a/gnark/src/main/java/org/hyperledger/besu/nativelib/gnark/LibGnarkEIP2537.java
+++ b/gnark/src/main/java/org/hyperledger/besu/nativelib/gnark/LibGnarkEIP2537.java
@@ -64,7 +64,8 @@ public static int eip2537_perform_operation(
         o_len.setValue(128);
         break;
       case BLS12_G1MULTIEXP_OPERATION_SHIM_VALUE:
-        if (i.length <= 192) {
+        // for pair count <= 2, use straight add/mul loop:
+        if (i.length <= 192 * 2) {
          ret =  eip2537blsG1MultiExp(i, output, err, i_len,
              EIP2537_PREALLOCATE_FOR_RESULT_BYTES, EIP2537_PREALLOCATE_FOR_ERROR_BYTES);
         } else {
@@ -87,7 +88,8 @@ public static int eip2537_perform_operation(
         o_len.setValue(256);
         break;
       case BLS12_G2MULTIEXP_OPERATION_SHIM_VALUE:
-        if (i.length <= 288) {
+        // for pair count <= 2, use straight add/mul loop:
+        if (i.length <= 288 * 2) {
           ret =  eip2537blsG2MultiExp(i, output, err, i_len,
               EIP2537_PREALLOCATE_FOR_RESULT_BYTES,
               EIP2537_PREALLOCATE_FOR_ERROR_BYTES);