diff --git a/libc/decl/errno_values.h b/libc/decl/errno_values.h
index d0663cdd..6cd8fdad 100644
--- a/libc/decl/errno_values.h
+++ b/libc/decl/errno_values.h
@@ -41,6 +41,7 @@
 #define EFBIG 49
 #define EXDEV 50
 #define ESPIPE 51
+#define ENAMETOOLONG 52
 
 #define EOPNOTSUPP ENOTSUP
 
diff --git a/libc/strerror.cpp b/libc/strerror.cpp
index fcc6f96b..5883d37e 100644
--- a/libc/strerror.cpp
+++ b/libc/strerror.cpp
@@ -70,6 +70,7 @@ extern "C" const char* sortix_strerror(int errnum)
 	case EFBIG: return "File too large";
 	case EXDEV: return "Improper link";
 	case ESPIPE: return "Cannot seek on stream";
+	case ENAMETOOLONG: return "Filename too long";
 	default: return "Unknown error condition";
 	}
 }