diff --git a/pkg/domain/dockerCompose/config.go b/pkg/domain/dockerCompose/config.go
index 63e8cd0..216230f 100644
--- a/pkg/domain/dockerCompose/config.go
+++ b/pkg/domain/dockerCompose/config.go
@@ -751,7 +751,7 @@ func (l *ServiceULimits) MergeLastWin(serviceULimits *ServiceULimits) {
 	// 	fallthrough
 
 	default:
-		l.mergeLastWinNProc(l.NProc)
+		l.mergeLastWinNProc(serviceULimits.NProc)
 		l.mergeLastWinNoFile(serviceULimits.NoFile)
 	}
 }
diff --git a/pkg/domain/dockerCompose/config_test.go b/pkg/domain/dockerCompose/config_test.go
index 879b2f9..927fc70 100644
--- a/pkg/domain/dockerCompose/config_test.go
+++ b/pkg/domain/dockerCompose/config_test.go
@@ -822,6 +822,49 @@ func TestServiceULimits_Equal(t *testing.T) {
 	}
 }
 
+func TestServiceULimits_MergeLastWin(t *testing.T) {
+	require := require.New(t)
+
+	testCases := []struct {
+		ServiceULimitsA        *dockerCompose.ServiceULimits
+		ServiceULimitsB        *dockerCompose.ServiceULimits
+		expectedServiceULimits *dockerCompose.ServiceULimits
+	}{
+		{
+			ServiceULimitsA:        &dockerCompose.ServiceULimits{},
+			ServiceULimitsB:        nil,
+			expectedServiceULimits: &dockerCompose.ServiceULimits{},
+		},
+		{
+			ServiceULimitsA: &dockerCompose.ServiceULimits{
+				NProc: 10,
+			},
+			ServiceULimitsB: &dockerCompose.ServiceULimits{
+				NProc: 10,
+			},
+			expectedServiceULimits: &dockerCompose.ServiceULimits{
+				NProc: 10,
+			},
+		},
+		{
+			ServiceULimitsA: &dockerCompose.ServiceULimits{
+				NProc: 10,
+			},
+			ServiceULimitsB: &dockerCompose.ServiceULimits{
+				NProc: 20,
+			},
+			expectedServiceULimits: &dockerCompose.ServiceULimits{
+				NProc: 20,
+			},
+		},
+	}
+
+	for i, testCase := range testCases {
+		testCase.ServiceULimitsA.MergeLastWin(testCase.ServiceULimitsB)
+		require.Equal(testCase.expectedServiceULimits, testCase.ServiceULimitsA, "Failed test case %v", i)
+	}
+}
+
 func TestServiceULimitsNoFile_Equal(t *testing.T) {
 	require := require.New(t)