diff --git a/lib/libc/amd64/sys/vfork.S b/lib/libc/amd64/sys/vfork.S
index 30d7fd1932b7..8ec99aeaad21 100644
--- a/lib/libc/amd64/sys/vfork.S
+++ b/lib/libc/amd64/sys/vfork.S
@@ -65,7 +65,7 @@ ENTRY(vfork)
 	je	1f		/* yes */
 	movl	$0,%eax
 1:
-	jmp	%ecx
+	jmp	*%ecx
 2:
 	pushl	%ecx
 	PIC_PROLOGUE
diff --git a/lib/libc/i386/gen/alloca.S b/lib/libc/i386/gen/alloca.S
index 4aa0e321b9e7..76108fe7f845 100644
--- a/lib/libc/i386/gen/alloca.S
+++ b/lib/libc/i386/gen/alloca.S
@@ -57,4 +57,4 @@ ENTRY(alloca)
 	pushl	4(%ecx)
 	pushl	0(%ecx)
 	pushl	%eax		/* dummy to pop at callsite */
-	jmp	%edx		/* "return" */
+	jmp	*%edx		/* "return" */
diff --git a/lib/libc/i386/sys/Ovfork.S b/lib/libc/i386/sys/Ovfork.S
index 30d7fd1932b7..8ec99aeaad21 100644
--- a/lib/libc/i386/sys/Ovfork.S
+++ b/lib/libc/i386/sys/Ovfork.S
@@ -65,7 +65,7 @@ ENTRY(vfork)
 	je	1f		/* yes */
 	movl	$0,%eax
 1:
-	jmp	%ecx
+	jmp	*%ecx
 2:
 	pushl	%ecx
 	PIC_PROLOGUE