1 files changed, 1 insertions, 0 deletions
diff --git a/src/os.h b/src/os.h
index 654e754..d231e67 100644
--- a/src/os.h
+++ b/src/os.h
@@ -25,6 +25,7 @@
  * between Windows and not-Windows under the rug.
  */
 
+#include <errno.h>
 #include <fcntl.h>
 #ifdef _WIN32
 #define NOMINMAX