diff --git a/source/fdisk/cmd.c b/source/fdisk/cmd.c
index 033328b..f71c674 100644
--- a/source/fdisk/cmd.c
+++ b/source/fdisk/cmd.c
@@ -327,6 +327,12 @@ void Command_Line_Delete( void )
    else if ( 0 == strcmp( arg[1].choice, "LOG" ) ) {
       if ( ( arg[1].value >= 1 ) && ( arg[1].value <= MAX_LOGICAL_DRIVES ) &&
            ( ( part_num = Nth_Log_Part_Defined( pDrive, arg[1].value - 1  ) ) < MAX_LOGICAL_DRIVES ) ) {
+      
+         if ( !pDrive->ext_usable ) {
+            /* NLS:No usable extended partition found. */
+            con_print( svarlang_str( 8, 7 ) );
+            exit( 9 );
+         }         
          error_code = Delete_Logical_Drive( part_num );
       }
       else {
@@ -343,6 +349,12 @@ void Command_Line_Delete( void )
       }
       else if ( ( arg[1].value >= 5 ) && ( arg[1].value <= 28 ) &&
               ( ( part_num = Nth_Log_Part_Defined( pDrive, arg[1].value - 5  ) ) < MAX_LOGICAL_DRIVES ) ) {
+
+         if ( !pDrive->ext_usable ) {
+            /* NLS:No usable extended partition found. */
+            con_print( svarlang_str( 8, 7 ) );
+            exit( 9 );
+         } 
          error_code = Delete_Logical_Drive( (int)( part_num ) );
       }
       else {