diff --git a/arch/x86/cpu/start.S b/arch/x86/cpu/start.S
index 329bb3ab35..71cab22e2a 100644
--- a/arch/x86/cpu/start.S
+++ b/arch/x86/cpu/start.S
@@ -85,6 +85,12 @@ car_init_ret:
 	/* Align global data to 16-byte boundary */
 	andl	$0xfffffff0, %esp
 
+	/* Zero the global data since it won't happen later */
+	xorl	%eax, %eax
+	movl	$GENERATED_GBL_DATA_SIZE, %ecx
+	movl	%esp, %edi
+	rep	stosb
+
 	/* Setup first parameter to setup_gdt */
 	movl	%esp, %eax