diff --git a/src/fs/fat12.h b/src/fs/fat12.h
index ef8818f..5a02895 100644
--- a/src/fs/fat12.h
+++ b/src/fs/fat12.h
@@ -16,8 +16,7 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.*
  *************************************************************************/
 
-#if !defined(KPMCORE_FAT12_H)
-
+#ifndef KPMCORE_FAT12_H
 #define KPMCORE_FAT12_H
 
 #include "util/libpartitionmanagerexport.h"
@@ -62,10 +61,10 @@ public:
         return m_Create;
     }
     CommandSupportType supportGrow() const override {
-        return m_Grow;
+        return cmdSupportNone;
     }
     CommandSupportType supportShrink() const override {
-        return m_Shrink;
+        return cmdSupportNone;
     }
     CommandSupportType supportMove() const override {
         return m_Move;
diff --git a/src/fs/fat16.h b/src/fs/fat16.h
index a654431..ea988a5 100644
--- a/src/fs/fat16.h
+++ b/src/fs/fat16.h
@@ -16,8 +16,7 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.*
  *************************************************************************/
 
-#if !defined(KPMCORE_FAT16_H)
-
+#ifndef KPMCORE_FAT16_H
 #define KPMCORE_FAT16_H
 
 #include "fs/fat12.h"
@@ -43,6 +42,13 @@ public:
     bool create(Report& report, const QString& deviceNode) override;
     bool resize(Report& report, const QString& deviceNode, qint64 length) const override;
 
+    CommandSupportType supportGrow() const override {
+        return m_Grow;
+    }
+    CommandSupportType supportShrink() const override {
+        return m_Shrink;
+    }
+
     qint64 minCapacity() const override;
     qint64 maxCapacity() const override;
     bool supportToolFound() const override;