diff --git a/pkgs/by-name/sy/syslinux/gcc10.patch b/pkgs/by-name/sy/syslinux/gcc10.patch
deleted file mode 100644
index f4893a912313..000000000000
--- a/pkgs/by-name/sy/syslinux/gcc10.patch
+++ /dev/null
@@ -1,33 +0,0 @@
-diff --git a/dos/string.h b/dos/string.h
-index f648de2..a502132 100644
---- a/dos/string.h
-+++ b/dos/string.h
-@@ -5,12 +5,13 @@
- #ifndef _STRING_H
- #define _STRING_H
- 
-+#include <stddef.h>
-+
- /* Standard routines */
- #define memcpy(a,b,c)	__builtin_memcpy(a,b,c)
- #define memmove(a,b,c)	__builtin_memmove(a,b,c)
- #define memset(a,b,c)	__builtin_memset(a,b,c)
- #define strcpy(a,b)	__builtin_strcpy(a,b)
--#define strlen(a)	__builtin_strlen(a)
- 
- /* This only returns true or false */
- static inline int memcmp(const void *__m1, const void *__m2, unsigned int __n)
-@@ -21,6 +22,13 @@ static inline int memcmp(const void *__m1, const void *__m2, unsigned int __n)
-     return rv;
- }
- 
-+static inline size_t strlen(const char *s)
-+{
-+    size_t len = 0;
-+    while (*s++) len++;
-+    return len;
-+}
-+
- extern char *strchr(const char *s, int c);
- 
- #endif /* _STRING_H */
diff --git a/pkgs/by-name/sy/syslinux/package.nix b/pkgs/by-name/sy/syslinux/package.nix
index c1d4b276860b..717327cd1cd0 100644
--- a/pkgs/by-name/sy/syslinux/package.nix
+++ b/pkgs/by-name/sy/syslinux/package.nix
@@ -36,9 +36,9 @@ stdenv.mkDerivation {
         };
     in
     [
-      ./gcc10.patch
       (fetchArchlinuxPatch "0002-gfxboot-menu-label.patch" "sha256-eoId3jn4eRxItil5naoGMBGOJM/p5FG74ePwxiJ0w/8=")
       (fetchArchlinuxPatch "0005-gnu-efi-version-compatibility.patch" "sha256-5oZ/24emWNPHx621v/9i2xU6rodpVCM0R18hCU35eDk=")
+      (fetchArchlinuxPatch "0006-Replace-builtin-strlen-that-appears-to-get-optimized.patch" "sha256-aq2vKqGonhMI2gRrAYNe+VRD8Vwijn7kOOv5wqAncx8=")
       (fetchArchlinuxPatch "0025-reproducible-build.patch" "sha256-vhth9CFHqChPQPgGhUWVpYwMFnnjoMVIGr7Wfu1jcDY=")
       (fetchArchlinuxPatch
         # mbr.bin: too big (452 > 440)