diff --git a/test/mock/kernel/mock_framework.zig b/test/mock/kernel/mock_framework.zig
index 2297371..6c7da66 100644
--- a/test/mock/kernel/mock_framework.zig
+++ b/test/mock/kernel/mock_framework.zig
@@ -65,7 +65,7 @@ const DataElement = union(DataElementType) {
     PTR_CONST_GdtPtr: *const gdt.GdtPtr,
     PTR_CONST_IdtPtr: *const idt.IdtPtr,
     ERROR_IDTERROR_VOID: idt.IdtError!void,
-    EFN_OVOID: extern fn () void,
+    EFN_OVOID: fn () callconv(.C) void,
     NFN_OVOID: fn () callconv(.Naked) void,
     FN_OVOID: fn () void,
     FN_OUSIZE: fn () usize,
@@ -81,7 +81,7 @@ const DataElement = union(DataElementType) {
     FN_IECmosStatusRegister_IBOOL_OU8: fn (cmos.StatusRegister, bool) u8,
     FN_IECmosStatusRegister_IU8_IBOOL_OVOID: fn (cmos.StatusRegister, u8, bool) void,
     FN_IECmosRtcRegister_OU8: fn (cmos.RtcRegister) u8,
-    FN_IU8_IEFNOVOID_OERRORIDTERRORVOID: fn (u8, extern fn () void) idt.IdtError!void,
+    FN_IU8_IEFNOVOID_OERRORIDTERRORVOID: fn (u8, fn () callconv(.C) void) idt.IdtError!void,
     FN_IU8_INFNOVOID_OERRORIDTERRORVOID: fn (u8, fn () callconv(.Naked) void) idt.IdtError!void,
     FN_IPTRCONSTGDTPTR_OVOID: fn (*const gdt.GdtPtr) void,
     FN_IPTRCONSTIDTPTR_OVOID: fn (*const idt.IdtPtr) void,
@@ -170,7 +170,7 @@ fn Mock() type {
                 *const gdt.GdtPtr => DataElement{ .PTR_CONST_GdtPtr = arg },
                 *const idt.IdtPtr => DataElement{ .PTR_CONST_IdtPtr = arg },
                 idt.IdtError!void => DataElement{ .ERROR_IDTERROR_VOID = arg },
-                extern fn () void => DataElement{ .EFN_OVOID = arg },
+                fn () callconv(.C) void => DataElement{ .EFN_OVOID = arg },
                 fn () callconv(.Naked) void => DataElement{ .NFN_OVOID = arg },
                 fn () void => DataElement{ .FN_OVOID = arg },
                 fn () usize => DataElement{ .FN_OUSIZE = arg },
@@ -188,7 +188,7 @@ fn Mock() type {
                 fn (cmos.RtcRegister) u8 => DataElement{ .FN_IECmosRtcRegister_OU8 = arg },
                 fn (*const gdt.GdtPtr) void => DataElement{ .FN_IPTRCONSTGDTPTR_OVOID = arg },
                 fn (*const idt.IdtPtr) void => DataElement{ .FN_IPTRCONSTIDTPTR_OVOID = arg },
-                fn (u8, extern fn () void) idt.IdtError!void => DataElement{ .FN_IU8_IEFNOVOID_OERRORIDTERRORVOID = arg },
+                fn (u8, fn () callconv(.C) void) idt.IdtError!void => DataElement{ .FN_IU8_IEFNOVOID_OERRORIDTERRORVOID = arg },
                 fn (u8, fn () callconv(.Naked) void) idt.IdtError!void => DataElement{ .FN_IU8_INFNOVOID_OERRORIDTERRORVOID = arg },
                 else => @compileError("Type not supported: " ++ @typeName(@TypeOf(arg))),
             };
@@ -215,7 +215,7 @@ fn Mock() type {
                 *const gdt.GdtPtr => DataElement.PTR_CONST_GdtPtr,
                 *const idt.IdtPtr => DataElement.PTR_CONST_IdtPtr,
                 idt.IdtError!void => DataElement.ERROR_IDTERROR_VOID,
-                extern fn () void => DataElementType.EFN_OVOID,
+                fn () callconv(.C) void => DataElementType.EFN_OVOID,
                 fn () callconv(.Naked) void => DataElementType.NFN_OVOID,
                 fn () void => DataElementType.FN_OVOID,
                 fn () u16 => DataElementType.FN_OU16,
@@ -232,7 +232,7 @@ fn Mock() type {
                 fn (cmos.RtcRegister) u8 => DataElementType.FN_IECmosRtcRegister_OU8,
                 fn (*const gdt.GdtPtr) void => DataElementType.FN_IPTRCONSTGDTPTR_OVOID,
                 fn (*const idt.IdtPtr) void => DataElementType.FN_IPTRCONSTIDTPTR_OVOID,
-                fn (u8, extern fn () void) idt.IdtError!void => DataElementType.FN_IU8_IEFNOVOID_OERRORIDTERRORVOID,
+                fn (u8, fn () callconv(.C) void) idt.IdtError!void => DataElementType.FN_IU8_IEFNOVOID_OERRORIDTERRORVOID,
                 fn (u8, fn () callconv(.Naked) void) idt.IdtError!void => DataElementType.FN_IU8_INFNOVOID_OERRORIDTERRORVOID,
                 else => @compileError("Type not supported: " ++ @typeName(T)),
             };
@@ -261,7 +261,7 @@ fn Mock() type {
                 *const gdt.GdtPtr => element.PTR_CONST_GdtPtr,
                 *const idt.IdtPtr => element.PTR_CONST_IdtPtr,
                 idt.IdtError!void => element.ERROR_IDTERROR_VOID,
-                extern fn () void => element.EFN_OVOID,
+                fn () callconv(.C) void => element.EFN_OVOID,
                 fn () callconv(.Naked) void => element.NFN_OVOID,
                 fn () void => element.FN_OVOID,
                 fn () u16 => element.FN_OU16,
@@ -278,7 +278,7 @@ fn Mock() type {
                 fn (cmos.RtcRegister) u8 => element.FN_IECmosRtcRegister_OU8,
                 fn (*const gdt.GdtPtr) void => element.FN_IPTRCONSTGDTPTR_OVOID,
                 fn (*const idt.IdtPtr) void => element.FN_IPTRCONSTIDTPTR_OVOID,
-                fn (u8, extern fn () void) idt.IdtError!void => element.FN_IU8_IEFNOVOID_OERRORIDTERRORVOID,
+                fn (u8, fn () callconv(.C) void) idt.IdtError!void => element.FN_IU8_IEFNOVOID_OERRORIDTERRORVOID,
                 fn (u8, fn () callconv(.Naked) void) idt.IdtError!void => element.FN_IU8_INFNOVOID_OERRORIDTERRORVOID,
                 else => @compileError("Type not supported: " ++ @typeName(T)),
             };