diff --git a/src/modules/module_17200.c b/src/modules/module_17200.c
index 7236b14d3..b40ace1e9 100644
--- a/src/modules/module_17200.c
+++ b/src/modules/module_17200.c
@@ -172,10 +172,9 @@ u64 module_esalt_size (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED
 
 void hex_to_binary (const char *source, int len, char* out)
 {
-  const char *pos = source;
-  for (size_t count = 0; count < (size_t) len/2; count++) {
-    sscanf(pos, "%2hhx", &out[count]);
-    pos += 2;
+  for (int i = 0, j = 0; j < len; i += 1, j += 2)
+  {
+    out[i] = hex_to_u8 ((const u8 *) &source[j]);
   }
 }
 
diff --git a/src/modules/module_17210.c b/src/modules/module_17210.c
index 2e1d90298..8d395a2a1 100644
--- a/src/modules/module_17210.c
+++ b/src/modules/module_17210.c
@@ -172,10 +172,9 @@ u64 module_esalt_size (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED
 
 void hex_to_binary (const char *source, int len, char* out)
 {
-  const char *pos = source;
-  for (size_t count = 0; count < (size_t) len/2; count++) {
-    sscanf(pos, "%2hhx", &out[count]);
-    pos += 2;
+  for (int i = 0, j = 0; j < len; i += 1, j += 2)
+  {
+    out[i] = hex_to_u8 ((const u8 *) &source[j]);
   }
 }
 
diff --git a/src/modules/module_17220.c b/src/modules/module_17220.c
index 2b6c16bfa..cc3c5a851 100644
--- a/src/modules/module_17220.c
+++ b/src/modules/module_17220.c
@@ -172,10 +172,9 @@ u64 module_esalt_size (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED
 
 void hex_to_binary (const char *source, int len, char* out)
 {
-  const char *pos = source;
-  for (size_t count = 0; count < (size_t) len/2; count++) {
-    sscanf(pos, "%2hhx", &out[count]);
-    pos += 2;
+  for (int i = 0, j = 0; j < len; i += 1, j += 2)
+  {
+    out[i] = hex_to_u8 ((const u8 *) &source[j]);
   }
 }
 
diff --git a/src/modules/module_17230.c b/src/modules/module_17230.c
index 649996f45..741bb0e5a 100644
--- a/src/modules/module_17230.c
+++ b/src/modules/module_17230.c
@@ -172,10 +172,9 @@ u64 module_esalt_size (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED
 
 void hex_to_binary (const char *source, int len, char* out)
 {
-  const char *pos = source;
-  for (size_t count = 0; count < (size_t) len/2; count++) {
-    sscanf(pos, "%2hhx", &out[count]);
-    pos += 2;
+  for (int i = 0, j = 0; j < len; i += 1, j += 2)
+  {
+    out[i] = hex_to_u8 ((const u8 *) &source[j]);
   }
 }