diff --git a/include/low_pass_filter.h b/include/low_pass_filter.h
index 2f0c9aa..0edca69 100644
--- a/include/low_pass_filter.h
+++ b/include/low_pass_filter.h
@@ -16,10 +16,11 @@ static inline double low_pass_alpha(double TR, double time_diff_ms) {
     return (freq * TR / 5.0) / (1.0 + freq * TR / 5.0);
 }
 
-// Initializes the low-pass filter by calculating and storing the alpha value based on the given response time.
+// Initializes the low-pass filter by calculating and storing the alpha value based on the given
+// response time.
 w_status_t low_pass_filter_init(double *alpha, double response_time);
 
 // Updates the low-pass filter with a new value and returns the operation status
-w_status_t update_low_pass(double *alpha, uint16_t new_input_value, double *low_pass_value);
+w_status_t update_low_pass(double alpha, uint16_t new_input_value, double *low_pass_value);
 
 #endif /* ROCKETLIB_LOW_PASS_FILTER_H */
\ No newline at end of file
diff --git a/unit_tests/low_pass_filter_test.c b/unit_tests/low_pass_filter_test.c
index 7d24e17..1091ceb 100644
--- a/unit_tests/low_pass_filter_test.c
+++ b/unit_tests/low_pass_filter_test.c
@@ -34,32 +34,32 @@ void test_update_low_pass() {
     for (int i = 1; i <= iterations; ++i) {
         // Store the previous low_pass_value before updating
         double previous_low_pass = low_pass_value;
-
         // Calculate the expected value based on the low-pass filter formula
         double expected = (alpha * new_input_value) + ((1.0 - alpha) * previous_low_pass);
-
         // Update the low-pass filter with the fixed input value
-        result = update_low_pass(&alpha, new_input_value, &low_pass_value);
+        result = update_low_pass(alpha, new_input_value, &low_pass_value);
         w_assert(result == W_SUCCESS);
-
         // Print the current iteration and values
         printf(
             "Iteration %2d: Low-Pass Value = %.4f | Expected ~ %.4f\n", i, low_pass_value, expected
         );
-
         // Verify the correctness of the low-pass update
         w_assert(fabs(low_pass_value - expected) < EPSILON);
     }
 
     printf("\nAll iterations completed successfully.\n\n");
 
-    // Test with NULL alpha
-    result = update_low_pass(NULL, new_input_value, &low_pass_value);
+    // Test with alpha out of range
+    result = update_low_pass(-0.1, new_input_value, &low_pass_value);
+    w_assert(result == W_INVALID_PARAM);
+    printf("Invalid alpha (negative) test passed.\n");
+
+    result = update_low_pass(1.1, new_input_value, &low_pass_value);
     w_assert(result == W_INVALID_PARAM);
-    printf("Null alpha test passed.\n");
+    printf("Invalid alpha (greater than 1) test passed.\n");
 
     // Test with NULL low_pass_value
-    result = update_low_pass(&alpha, new_input_value, NULL);
+    result = update_low_pass(alpha, new_input_value, NULL);
     w_assert(result == W_INVALID_PARAM);
     printf("Null low_pass_value test passed.\n");
 }