diff --git a/arch/x86_64/src/common/fork.S b/arch/x86_64/src/common/fork.S
index f526a5fa956..1621b560474 100644
--- a/arch/x86_64/src/common/fork.S
+++ b/arch/x86_64/src/common/fork.S
@@ -118,10 +118,14 @@ up_fork:
     pushq   %r12
     movq    %rsp, %rdi
 
+    subq    $8, %rsp
+
     /* call function */
 
     callq x86_64_fork
 
+    addq    $8, %rsp
+
     /* Do not modify return value %rax */
     /* Restore non-volatile registers */