diff --git a/libc/decl/errno_values.h b/libc/decl/errno_values.h
index 4a2abc24..3d39ef01 100644
--- a/libc/decl/errno_values.h
+++ b/libc/decl/errno_values.h
@@ -55,6 +55,7 @@
 #define EINPROGRESS 63
 #define EALREADY 64
 #define ESHUTDOWN 65
+#define ECONNABORTED 66
 
 #define EOPNOTSUPP ENOTSUP
 
diff --git a/libc/strerror.cpp b/libc/strerror.cpp
index ea6bcbf3..3be80c10 100644
--- a/libc/strerror.cpp
+++ b/libc/strerror.cpp
@@ -84,6 +84,7 @@ extern "C" const char* sortix_strerror(int errnum)
 	case EINPROGRESS: return "Operation in progress";
 	case EALREADY: return "Connection already in progress";
 	case ESHUTDOWN: return "Cannot send after transport endpoint shutdown";
+	case ECONNABORTED: return "Connection aborted";
 	default: return "Unknown error condition";
 	}
 }