diff --git a/xen/arch/arm/arm32/head.S b/xen/arch/arm/arm32/head.S
index a96d5d3503..4ff5c220bc 100644
--- a/xen/arch/arm/arm32/head.S
+++ b/xen/arch/arm/arm32/head.S
@@ -185,12 +185,15 @@ zero_bss:
         PRINT("- Zero BSS -\r\n")
         mov_w r0, __bss_start        /* r0 := vaddr(__bss_start) */
         mov_w r1, __bss_end          /* r1 := vaddr(__bss_end)   */
+        cmp   r1, r0
+        beq   skip_bss
 
         mov   r2, #0
 1:      str   r2, [r0], #4
         cmp   r0, r1
         blo   1b
 
+skip_bss:
         mov   pc, lr
 ENDPROC(zero_bss)
 
diff --git a/xen/arch/arm/arm64/head.S b/xen/arch/arm/arm64/head.S
index 14c3720d80..72c7b24498 100644
--- a/xen/arch/arm/arm64/head.S
+++ b/xen/arch/arm/arm64/head.S
@@ -346,6 +346,8 @@ FUNC_LOCAL(zero_bss)
         PRINT("- Zero BSS -\r\n")
         ldr   x0, =__bss_start       /* x0 := vaddr(__bss_start) */
         ldr   x1, =__bss_end         /* x1 := vaddr(__bss_end)   */
+        cmp   x1, x0
+        beq   skip_bss
 
 1:      str   xzr, [x0], #8
         cmp   x0, x1