diff --git a/src/lib/y2storage/proposal/devices_planner.rb b/src/lib/y2storage/proposal/devices_planner.rb
index 4a2260f74..790a1641e 100644
--- a/src/lib/y2storage/proposal/devices_planner.rb
+++ b/src/lib/y2storage/proposal/devices_planner.rb
@@ -287,6 +287,8 @@ def adjust_sizes(planned_device, volume)
         planned_device.min_size = min_size(volume)
         planned_device.max_size = max_size(volume)
 
+        return if volume.ignore_adjust_by_ram?
+
         if volume.adjust_by_ram?
           planned_device.min_size = [planned_device.min_size, ram_size].max
           planned_device.max_size = [planned_device.max_size, ram_size].max
diff --git a/src/lib/y2storage/volume_specification.rb b/src/lib/y2storage/volume_specification.rb
index a6ec332e4..ae3ceca1c 100644
--- a/src/lib/y2storage/volume_specification.rb
+++ b/src/lib/y2storage/volume_specification.rb
@@ -177,10 +177,16 @@ class VolumeSpecification
     # @return [Boolean] true if #snapshots_size and #snapshots_percentage should be ignored
     attr_accessor :ignore_snapshots_sizes
 
+    # Whether to ignore any possible effect on the size derived from RAM size
+    #
+    # @return [Boolean] true if #adjust_by_ram should be ignored
+    attr_accessor :ignore_adjust_by_ram
+
     alias_method :proposed?, :proposed
     alias_method :proposed_configurable?, :proposed_configurable
     alias_method :adjust_by_ram?, :adjust_by_ram
     alias_method :adjust_by_ram_configurable?, :adjust_by_ram_configurable
+    alias_method :ignore_adjust_by_ram?, :ignore_adjust_by_ram
     alias_method :snapshots?, :snapshots
     alias_method :snapshots_configurable?, :snapshots_configurable
     alias_method :ignore_snapshots_sizes?, :ignore_snapshots_sizes
@@ -380,6 +386,7 @@ def apply_defaults
       @fs_types                   = []
       @ignore_fallback_sizes      = false
       @ignore_snapshots_sizes     = false
+      @ignore_adjust_by_ram       = false
       @reformat                   = true
     end
 
diff --git a/test/y2storage/proposal/devices_planner_test.rb b/test/y2storage/proposal/devices_planner_test.rb
index 9703cf2aa..c72b0d8bd 100755
--- a/test/y2storage/proposal/devices_planner_test.rb
+++ b/test/y2storage/proposal/devices_planner_test.rb
@@ -472,6 +472,12 @@
               expect(planned_device.min_size).to eq(8.GiB)
               expect(planned_device.max_size).to eq(8.GiB)
             end
+
+            it "does not extend the sizes to ram size if #ignore_adjust_by_ram is set" do
+              vol_in_settings.ignore_adjust_by_ram = true
+              expect(planned_device.min_size).to eq(1.GiB)
+              expect(planned_device.max_size).to eq(2.GiB)
+            end
           end
 
           context "when it is planning a device with btrfs filesystem" do