diff --git a/core/os/os_windows.odin b/core/os/os_windows.odin
index 45be28e9f..aef7d44d5 100644
--- a/core/os/os_windows.odin
+++ b/core/os/os_windows.odin
@@ -4,6 +4,7 @@ package os
 import win32 "core:sys/windows"
 import "core:runtime"
 import "core:intrinsics"
+import "core:c"
 
 Handle    :: distinct uintptr
 File_Time :: distinct u64
@@ -139,7 +140,7 @@ _processor_core_count :: proc() -> int {
 		result = win32.GetLogicalProcessorInformation(&processors[0], &length)
 		if result {
 			for processor in processors {
-				if processor.Relationship == windows.RelationProcessorCore {
+				if processor.Relationship == win32.RelationProcessorCore {
 					thread := intrinsics.count_ones(processor.ProcessorMask)
 					thread_count += thread
 				}
diff --git a/core/sys/windows/kernel32.odin b/core/sys/windows/kernel32.odin
index 2a74ea44e..6def41c5d 100644
--- a/core/sys/windows/kernel32.odin
+++ b/core/sys/windows/kernel32.odin
@@ -1043,7 +1043,7 @@ DUMMYUNIONNAME_u :: struct #raw_union {
 }
 
 SYSTEM_LOGICAL_PROCESSOR_INFORMATION :: struct {
-	ProcessorMask: ULONGPTR,
+	ProcessorMask: ULONG_PTR,
 	Relationship: LOGICAL_PROCESSOR_RELATIONSHIP,
 	DummyUnion: DUMMYUNIONNAME_u,
 }