diff --git a/include/fmt/os.h b/include/fmt/os.h
index 7e181c86..eb218cf5 100644
--- a/include/fmt/os.h
+++ b/include/fmt/os.h
@@ -31,7 +31,8 @@
 #endif
 #if (FMT_HAS_INCLUDE(<fcntl.h>) || defined(__APPLE__) || \
      defined(__linux__)) &&                              \
-    (!defined(WINAPI_FAMILY) || (WINAPI_FAMILY == WINAPI_FAMILY_DESKTOP_APP))
+    (!defined(WINAPI_FAMILY) || (WINAPI_FAMILY == WINAPI_FAMILY_DESKTOP_APP)) && \
+    (!defined(__OpenBSD__))
 #  include <fcntl.h>  // for O_RDONLY
 #  define FMT_USE_FCNTL 1
 #else