diff --git a/client/src/cmdhw.c b/client/src/cmdhw.c
index 572516639..e9f05ce30 100644
--- a/client/src/cmdhw.c
+++ b/client/src/cmdhw.c
@@ -640,10 +640,10 @@ static int CmdReadmem(const char *Cmd) {
 
     void *argtable[] = {
         arg_param_begin,
-        arg_int0("a", "adr", "<dec>", "flash address to start reading from"),
-        arg_int0("l", "len", "<dec>", "length (default 32 or 512KB)"),
+        arg_u64_0("a", "adr", "<dec>", "flash address to start reading from"),
+        arg_u64_0("l", "len", "<dec>", "length (default 32 or 512KB)"),
         arg_str0("f", "file", "<fn>", "save to file"),
-        arg_int0("c", "cols", "<dec>", "column breaks"),
+        arg_u64_0("c", "cols", "<dec>", "column breaks"),
         arg_lit0("r", "raw", "use raw address mode: read from anywhere, not just flash"),
         arg_param_end
     };
diff --git a/client/src/proxmark3.c b/client/src/proxmark3.c
index a6cfe1dd7..024258819 100644
--- a/client/src/proxmark3.c
+++ b/client/src/proxmark3.c
@@ -1139,7 +1139,7 @@ int main(int argc, char *argv[]) {
                 show_help(false, exec_name);
                 return 1;
             }
-            uint32_t tmpaddr = strtol(argv[i + 1], NULL, 10);
+            uint32_t tmpaddr = strtoul(argv[i + 1], NULL, 0);
             dumpmem_addr = tmpaddr;
             i++;
             continue;
@@ -1150,7 +1150,7 @@ int main(int argc, char *argv[]) {
                 show_help(false, exec_name);
                 return 1;
             }
-            uint32_t tmplen = strtol(argv[i + 1], NULL, 10);
+            uint32_t tmplen = strtoul(argv[i + 1], NULL, 0);
             dumpmem_len = tmplen;
             i++;
             continue;