diff --git a/i2c_smbus/i2c_smbus_linux.cpp b/i2c_smbus/i2c_smbus_linux.cpp
index 940023b6..dd90be57 100644
--- a/i2c_smbus/i2c_smbus_linux.cpp
+++ b/i2c_smbus/i2c_smbus_linux.cpp
@@ -96,6 +96,7 @@ bool i2c_smbus_linux_detect()
 
     if(ent == NULL)
     {
+        closedir(dir);
         return(false);
     }