diff --git a/src/nanoarrow/ipc/decoder.c b/src/nanoarrow/ipc/decoder.c
index 7b24bc3a9..42ba24573 100644
--- a/src/nanoarrow/ipc/decoder.c
+++ b/src/nanoarrow/ipc/decoder.c
@@ -25,8 +25,9 @@
 #include "nanoarrow/nanoarrow.h"
 #include "nanoarrow/nanoarrow_ipc.h"
 
-// R 3.6 / Windows builds on a very old toolchain that does not define ENODATA
-#if defined(_WIN32) && !defined(_MSC_VER) && !defined(ENODATA)
+// ENODATA is an XSI extension and is not defined by all libcs (e.g., older
+// Windows/MinGW toolchains used by R 3.6, FreeBSD, and OpenBSD).
+#if !defined(ENODATA)
 #define ENODATA 120
 #endif
 
diff --git a/src/nanoarrow/ipc/reader.c b/src/nanoarrow/ipc/reader.c
index f69d441f2..0b99b828e 100644
--- a/src/nanoarrow/ipc/reader.c
+++ b/src/nanoarrow/ipc/reader.c
@@ -23,8 +23,9 @@
 #include "nanoarrow/nanoarrow.h"
 #include "nanoarrow/nanoarrow_ipc.h"
 
-// R 3.6 / Windows builds on a very old toolchain that does not define ENODATA
-#if defined(_WIN32) && !defined(_MSC_VER) && !defined(ENODATA)
+// ENODATA is an XSI extension and is not defined by all libcs (e.g., older
+// Windows/MinGW toolchains used by R 3.6, FreeBSD, and OpenBSD).
+#if !defined(ENODATA)
 #define ENODATA 120
 #endif