diff --git a/headers/private/kernel/arch/ppc/arch_cpu.h b/headers/private/kernel/arch/ppc/arch_cpu.h
index b49dca7d98..d8ec8f5ee5 100644
--- a/headers/private/kernel/arch/ppc/arch_cpu.h
+++ b/headers/private/kernel/arch/ppc/arch_cpu.h
@@ -14,6 +14,8 @@
 #define _BIG_ENDIAN 1
 #define _LITTLE_ENDIAN 0
 
+#define FUNCTION_CALL_PARAMETER_ALIGNMENT_TYPE	uint64
+
 #define ATOMIC64_FUNCS_ARE_SYSCALLS 1
 
 struct iframe {
diff --git a/headers/private/kernel/arch/x86/arch_cpu.h b/headers/private/kernel/arch/x86/arch_cpu.h
index c80e856b5d..c313f662c6 100644
--- a/headers/private/kernel/arch/x86/arch_cpu.h
+++ b/headers/private/kernel/arch/x86/arch_cpu.h
@@ -14,6 +14,8 @@
 #define _BIG_ENDIAN 0
 #define _LITTLE_ENDIAN 1
 
+#define FUNCTION_CALL_PARAMETER_ALIGNMENT_TYPE	uint32
+
 struct tss {
 	uint16 prev_task;
 	uint16 unused0;