diff --git a/srcpkgs/64tass/patches/fix-lines-limit.patch b/srcpkgs/64tass/patches/fix-lines-limit.patch
new file mode 100644
index 0000000000..66ddc27291
--- /dev/null
+++ b/srcpkgs/64tass/patches/fix-lines-limit.patch
@@ -0,0 +1,25 @@
+--- file.c	2020-04-07 21:18:24.000000000 +0200
++++ file.c	2020-04-22 20:11:45.714713362 +0200
+@@ -493,7 +493,8 @@
+                     tmp->data = (uint8_t *)malloc(len2);
+                     if (tmp->data != NULL) tmp->len = len2;
+                     max_lines = (len2 / 20 + 1024) & ~(size_t)1023;
+-                    if (max_lines > SIZE_MAX / sizeof *tmp->line) max_lines = SIZE_MAX / sizeof *tmp->line; /* overflow */
++                    if (max_lines >= INT32_MAX / sizeof *tmp->line)
++			max_lines = (INT32_MAX - 1) / sizeof *tmp->line; /* overflow */
+                     tmp->line = (size_t *)malloc(max_lines * sizeof *tmp->line);
+                     if (tmp->line == NULL) max_lines = 0;
+                 }
+@@ -718,8 +719,11 @@
+                 last_ubuff = ubuff;
+                 tmp->lines = lines;
+                 if (lines != max_lines) {
++                    if (lines >= INT32_MAX / sizeof *tmp->line)
++			lines = (INT32_MAX - 1) / sizeof *tmp->line; /* overflow */
+                     size_t *d = (size_t *)realloc(tmp->line, lines * sizeof *tmp->line);
+-                    if (lines == 0 || d != NULL) tmp->line = d;
++                    if (lines == 0 || d != NULL)
++			tmp->line = d;
+                 }
+             }
+             tmp->len = fp;