diff --git a/core/c/libc/errno.odin b/core/c/libc/errno.odin
index 7af763706..d28a24f56 100644
--- a/core/c/libc/errno.odin
+++ b/core/c/libc/errno.odin
@@ -40,7 +40,7 @@ when ODIN_OS == .FreeBSD {
 	ERANGE :: 34
 }
 
-when ODIN_OS == .OpenBSD {
+when ODIN_OS == .OpenBSD || ODIN_OS == .NetBSD {
 	@(private="file")
 	@(default_calling_convention="c")
 	foreign libc {
diff --git a/core/c/libc/time.odin b/core/c/libc/time.odin
index 4c4280f30..924cf4aec 100644
--- a/core/c/libc/time.odin
+++ b/core/c/libc/time.odin
@@ -45,7 +45,7 @@ when ODIN_OS == .Windows {
 	}
 }
 
-when ODIN_OS == .Linux || ODIN_OS == .FreeBSD || ODIN_OS == .Darwin || ODIN_OS == .OpenBSD || ODIN_OS == .Haiku {
+when ODIN_OS == .Linux || ODIN_OS == .FreeBSD || ODIN_OS == .Darwin || ODIN_OS == .OpenBSD || ODIN_OS == .NetBSD || ODIN_OS == .Haiku {
 	@(default_calling_convention="c")
 	foreign libc {
 		// 7.27.2 Time manipulation functions
diff --git a/core/c/libc/wctype.odin b/core/c/libc/wctype.odin
index cbce220d4..a41fe7fac 100644
--- a/core/c/libc/wctype.odin
+++ b/core/c/libc/wctype.odin
@@ -22,7 +22,7 @@ when ODIN_OS == .Windows {
 	wctrans_t :: distinct int
 	wctype_t  :: distinct u32
 
-} else when ODIN_OS == .OpenBSD {
+} else when ODIN_OS == .OpenBSD || ODIN_OS == .NetBSD {
 	wctrans_t :: distinct rawptr
 	wctype_t  :: distinct rawptr
 
diff --git a/core/os/stream.odin b/core/os/stream.odin
index 4e73284f0..9a168b95c 100644
--- a/core/os/stream.odin
+++ b/core/os/stream.odin
@@ -60,7 +60,7 @@ _file_stream_proc :: proc(stream_data: rawptr, mode: io.Stream_Mode, p: []byte,
 	case .Destroy:
 		err = .Empty
 	case .Query:
-		when ODIN_OS == .FreeBSD || ODIN_OS == .OpenBSD || ODIN_OS == .Haiku {
+		when ODIN_OS == .FreeBSD || ODIN_OS == .OpenBSD || ODIN_OS == .NetBSD || ODIN_OS == .Haiku {
 			return io.query_utility({.Close, .Flush, .Read, .Write, .Seek, .Size, .Query})
 		} else {
 			return io.query_utility({.Close, .Flush, .Read, .Read_At, .Write, .Write_At, .Seek, .Size, .Query})