diff --git a/fastimagehash.cpp b/fastimagehash.cpp
index 185dcd6..3356645 100644
--- a/fastimagehash.cpp
+++ b/fastimagehash.cpp
@@ -269,6 +269,9 @@ int whash_mem(void *buf, size_t buf_len, uchar *out, const int hash_size, int im
     if (remove_max_ll) {
         // Remove low level frequency
         wave_object w_haar_tmp = wave_init("haar");
+        int max_level = (int) (log((double) img_scale / ((double) w_haar_tmp->filtlength - 1.0)) / log(2.0));
+        ll_max_level = MIN(ll_max_level, max_level);
+
         wt2_object wt_haar_tmp = wt2_init(w_haar_tmp, "dwt", img_scale, img_scale, ll_max_level);
 
         double *coeffs = dwt2(wt_haar_tmp, data);
@@ -279,6 +282,7 @@ int whash_mem(void *buf, size_t buf_len, uchar *out, const int hash_size, int im
 
         wt2_free(wt_haar_tmp);
         wave_free(w_haar_tmp);
+        free(coeffs);
     }
 
     wave_object w = wave_init(wname);
diff --git a/fastimagehash.h b/fastimagehash.h
index ec62585..a4e40f5 100644
--- a/fastimagehash.h
+++ b/fastimagehash.h
@@ -1,7 +1,7 @@
 #ifndef FASTIMAGEHASH_FASTIMAGEHASH_H
 #define FASTIMAGEHASH_FASTIMAGEHASH_H
 
-#define FASTIMAGEHASH_VERSION "4.0"
+#define FASTIMAGEHASH_VERSION "4.1"
 
 
 #include <stdio.h>
diff --git a/imhash.c b/imhash.c
index 35d31c8..9609860 100644
--- a/imhash.c
+++ b/imhash.c
@@ -51,8 +51,8 @@ int main(int argc, char *argv[]) {
                 }
             }
             if (do_whash) {
-                if (whash_file(argv[i], hash, 8, 0, 1, "haar") == 0) {
-                    hash_to_hex_string_reversed(hash, hashstr, 8);
+                if (whash_file(argv[i], hash, 16, 0, 1, "haar") == 0) {
+                    hash_to_hex_string_reversed(hash, hashstr, 16);
                     printf("%s\tw:%s\n", argv[i], hashstr);
                 }
             }