diff --git a/sysdeps/x86_64/multiarch/memcpy-ssse3-back.S b/sysdeps/x86_64/multiarch/memcpy-ssse3-back.S
index b4890f4..4b717d9 100644
--- a/sysdeps/x86_64/multiarch/memcpy-ssse3-back.S
+++ b/sysdeps/x86_64/multiarch/memcpy-ssse3-back.S
@@ -48,8 +48,10 @@
 	.section .text.ssse3,"ax",@progbits
 #if !defined USE_AS_MEMPCPY && !defined USE_AS_MEMMOVE
 ENTRY (MEMPCPY_CHK)
+#ifdef _FORTIFY_SOURCE
 	cmpq	%rdx, %rcx
 	jb	HIDDEN_JUMPTARGET (__chk_fail)
+#endif
 END (MEMPCPY_CHK)
 
 ENTRY (MEMPCPY)
@@ -61,8 +63,10 @@ END (MEMPCPY)
 
 #if !defined USE_AS_BCOPY
 ENTRY (MEMCPY_CHK)
+#ifdef _FORTIFY_SOURCE
 	cmpq	%rdx, %rcx
 	jb	HIDDEN_JUMPTARGET (__chk_fail)
+#endif
 END (MEMCPY_CHK)
 #endif
 
diff --git a/sysdeps/x86_64/multiarch/memcpy-ssse3.S b/sysdeps/x86_64/multiarch/memcpy-ssse3.S
index 1ca88c0..a2f140b 100644
--- a/sysdeps/x86_64/multiarch/memcpy-ssse3.S
+++ b/sysdeps/x86_64/multiarch/memcpy-ssse3.S
@@ -48,8 +48,10 @@
 	.section .text.ssse3,"ax",@progbits
 #if !defined USE_AS_MEMPCPY && !defined USE_AS_MEMMOVE
 ENTRY (MEMPCPY_CHK)
+#ifdef _FORTIFY_SOURCE
 	cmpq	%rdx, %rcx
 	jb	HIDDEN_JUMPTARGET (__chk_fail)
+#endif
 END (MEMPCPY_CHK)
 
 ENTRY (MEMPCPY)
@@ -61,8 +63,10 @@ END (MEMPCPY)
 
 #if !defined USE_AS_BCOPY
 ENTRY (MEMCPY_CHK)
+#ifdef _FORTIFY_SOURCE
 	cmpq	%rdx, %rcx
 	jb	HIDDEN_JUMPTARGET (__chk_fail)
+#endif
 END (MEMCPY_CHK)
 #endif
 
diff --git a/sysdeps/x86_64/multiarch/memset-avx512-no-vzeroupper.S b/sysdeps/x86_64/multiarch/memset-avx512-no-vzeroupper.S
index 9687df0..2d0abee 100644
--- a/sysdeps/x86_64/multiarch/memset-avx512-no-vzeroupper.S
+++ b/sysdeps/x86_64/multiarch/memset-avx512-no-vzeroupper.S
@@ -29,8 +29,10 @@
 	.section .text.avx512,"ax",@progbits
 #if defined PIC
 ENTRY (MEMSET_CHK)
+#ifdef _FORTIFY_SOURCE
 	cmpq	%rdx, %rcx
 	jb	HIDDEN_JUMPTARGET (__chk_fail)
+#endif
 END (MEMSET_CHK)
 #endif