diff --git a/xtoskrnl/hl/x86/pic.c b/xtoskrnl/hl/x86/pic.c
index f0fa4f0..c3ae162 100644
--- a/xtoskrnl/hl/x86/pic.c
+++ b/xtoskrnl/hl/x86/pic.c
@@ -19,7 +19,7 @@
  */
 XTAPI
 VOID
-HlClearApicErrors()
+HlClearApicErrors(VOID)
 {
     /* Clear APIC errors */
     HlWriteApicRegister(APIC_ESR, 0);
@@ -34,7 +34,7 @@ HlClearApicErrors()
  */
 XTAPI
 VOID
-HlDisableLegacyPic()
+HlDisableLegacyPic(VOID)
 {
     HlIoPortOutByte(PIC1_DATA_PORT, 0xFF);
     HlIoPortOutByte(PIC2_DATA_PORT, 0xFF);
@@ -75,7 +75,7 @@ HlReadApicRegister(IN APIC_REGISTER Register)
  */
 XTAPI
 VOID
-HlSendEoi()
+HlSendEoi(VOID)
 {
     /* Send APIC EOI */
     HlWriteApicRegister(APIC_EOI, 0);
@@ -158,7 +158,7 @@ HlpCheckX2ApicSupport(VOID)
  */
 XTCDECL
 VOID
-HlpHandleApicSpuriousService()
+HlpHandleApicSpuriousService(VOID)
 {
 }
 
@@ -171,7 +171,7 @@ HlpHandleApicSpuriousService()
  */
 XTCDECL
 VOID
-HlpHandlePicSpuriousService()
+HlpHandlePicSpuriousService(VOID)
 {
 }
 
diff --git a/xtoskrnl/includes/amd64/hli.h b/xtoskrnl/includes/amd64/hli.h
index 681b94f..9158706 100644
--- a/xtoskrnl/includes/amd64/hli.h
+++ b/xtoskrnl/includes/amd64/hli.h
@@ -15,11 +15,11 @@
 /* HAL library routines forward references */
 XTAPI
 VOID
-HlClearApicErrors();
+HlClearApicErrors(VOID);
 
 XTAPI
 VOID
-HlDisableLegacyPic();
+HlDisableLegacyPic(VOID);
 
 XTFASTCALL
 ULONG
@@ -27,7 +27,7 @@ HlReadApicRegister(IN APIC_REGISTER Register);
 
 XTAPI
 VOID
-HlSendEoi();
+HlSendEoi(VOID);
 
 XTFASTCALL
 VOID
@@ -40,11 +40,11 @@ HlpCheckX2ApicSupport(VOID);
 
 XTCDECL
 VOID
-HlpHandleApicSpuriousService();
+HlpHandleApicSpuriousService(VOID);
 
 XTCDECL
 VOID
-HlpHandlePicSpuriousService();
+HlpHandlePicSpuriousService(VOID);
 
 XTAPI
 VOID
diff --git a/xtoskrnl/includes/i686/hli.h b/xtoskrnl/includes/i686/hli.h
index a57cd62..e4d3770 100644
--- a/xtoskrnl/includes/i686/hli.h
+++ b/xtoskrnl/includes/i686/hli.h
@@ -15,11 +15,11 @@
 /* HAL library routines forward references */
 XTAPI
 VOID
-HlClearApicErrors();
+HlClearApicErrors(VOID);
 
 XTAPI
 VOID
-HlDisableLegacyPic();
+HlDisableLegacyPic(VOID);
 
 XTFASTCALL
 ULONG
@@ -27,7 +27,7 @@ HlReadApicRegister(IN APIC_REGISTER Register);
 
 XTAPI
 VOID
-HlSendEoi();
+HlSendEoi(VOID);
 
 XTFASTCALL
 VOID
@@ -40,11 +40,11 @@ HlpCheckX2ApicSupport(VOID);
 
 XTCDECL
 VOID
-HlpHandleApicSpuriousService();
+HlpHandleApicSpuriousService(VOID);
 
 XTCDECL
 VOID
-HlpHandlePicSpuriousService();
+HlpHandlePicSpuriousService(VOID);
 
 XTAPI
 VOID