diff --git a/src/system/kernel/arch/x86/apm.cpp b/src/system/kernel/arch/x86/apm.cpp
index 71c13b7dbe..ac5757ad2d 100644
--- a/src/system/kernel/arch/x86/apm.cpp
+++ b/src/system/kernel/arch/x86/apm.cpp
@@ -93,7 +93,7 @@ call_apm_bios(bios_regs *regs)
 {
 #if _GNUC_ >= 4
 	// TODO: Fix this for GCC 4.3! The direct reference to sAPMBiosEntry
-	// in the ASM below causes undefined references.
+	// in the asm below causes undefined references.
 	asm volatile(
 		"pushfl; "
 		"pushl %%ebp; "
@@ -107,6 +107,8 @@ call_apm_bios(bios_regs *regs)
 		  "=S" (regs->esi), "=m" (regs->flags)
 		: "a" (regs->eax), "b" (regs->ebx), "c" (regs->ecx)
 		: "memory", "edi", "cc");
+#else
+	return B_ERROR;
 #endif
 
 	if (regs->flags & CARRY_FLAG)