diff --git a/src/AMOEBA/amoeba_kspace.cpp b/src/AMOEBA/amoeba_kspace.cpp
index 22b83c1b59..5e12deae1c 100644
--- a/src/AMOEBA/amoeba_kspace.cpp
+++ b/src/AMOEBA/amoeba_kspace.cpp
@@ -1137,7 +1137,7 @@ void PairAmoeba::kewald()
     // NOTE: also worry about satisfying Tinker minfft ?
 
     while (!factorable(ndfft1)) ndfft1++;
-    while (!factorable(ndfft2)) ndfft3++;
+    while (!factorable(ndfft2)) ndfft2++;
     while (!factorable(ndfft3)) ndfft3++;
   }