diff --git a/sys/amd64/amd64/support.S b/sys/amd64/amd64/support.S
index ab45e56a05f2..d3522ec52e0b 100644
--- a/sys/amd64/amd64/support.S
+++ b/sys/amd64/amd64/support.S
@@ -699,25 +699,6 @@ ENTRY(longjmp)
 	ret
 END(longjmp)
 
-/*
- * Support for BB-profiling (gcc -a).  The kernbb program will extract
- * the data from the kernel.
- */
-
-	.data
-	ALIGN_DATA
-	.globl bbhead
-bbhead:
-	.quad 0
-
-	.text
-NON_GPROF_ENTRY(__bb_init_func)
-	movq	$1,(%rdi)
-	movq	bbhead,%rax
-	movq	%rax,32(%rdi)
-	movq	%rdi,bbhead
-	NON_GPROF_RET
-
 /*
  * Support for reading MSRs in the safe manner.
  */
diff --git a/sys/i386/i386/support.s b/sys/i386/i386/support.s
index 29f1f407fbe8..0c55f6f6b733 100644
--- a/sys/i386/i386/support.s
+++ b/sys/i386/i386/support.s
@@ -789,26 +789,6 @@ ENTRY(longjmp)
 	ret
 END(longjmp)
 
-/*
- * Support for BB-profiling (gcc -a).  The kernbb program will extract
- * the data from the kernel.
- */
-
-	.data
-	ALIGN_DATA
-	.globl bbhead
-bbhead:
-	.long 0
-
-	.text
-NON_GPROF_ENTRY(__bb_init_func)
-	movl	4(%esp),%eax
-	movl	$1,(%eax)
-	movl	bbhead,%edx
-	movl	%edx,16(%eax)
-	movl	%eax,bbhead
-	NON_GPROF_RET
-
 /*
  * Support for reading MSRs in the safe manner.
  */