diff --git a/src/tests/benchmarks/benchmark_preamble.cc b/src/tests/benchmarks/benchmark_preamble.cc
index c004b6e30..cb0b54c3c 100644
--- a/src/tests/benchmarks/benchmark_preamble.cc
+++ b/src/tests/benchmarks/benchmark_preamble.cc
@@ -25,13 +25,14 @@
 
 void bm_forloop(benchmark::State& state)
 {
-    std::array<int32_t, GPS_CA_PREAMBLE_LENGTH_BITS> d_preamble_samples{};
+    std::array<int32_t, GPS_CA_PREAMBLE_LENGTH_SYMBOLS> d_preamble_samples{};
+    volatile int32_t res;  // Prevent the compiler from optimizing the loop away
     while (state.KeepRunning())
         {
             int32_t n = 0;
-            for (int32_t i = 0; i < GPS_CA_PREAMBLE_LENGTH_BITS; i++)
+            for (int32_t i = 0; i < GPS_CA_PREAMBLE_LENGTH_SYMBOLS; i++)
                 {
-                    if (GPS_CA_PREAMBLE[i] == '1')
+                    if (GPS_CA_PREAMBLE_SYMBOLS_STR[i] == '1')
                         {
                             d_preamble_samples[n] = 1;
                             n++;
@@ -42,16 +43,27 @@ void bm_forloop(benchmark::State& state)
                             n++;
                         }
                 }
+            res = d_preamble_samples[GPS_CA_PREAMBLE_LENGTH_SYMBOLS - 1];
+        }
+    if (res > 1)
+        {
+            // Avoid unused-but-set-variable warning
         }
 }
 
 
 void bm_generate(benchmark::State& state)
 {
-    std::array<int32_t, GPS_CA_PREAMBLE_LENGTH_BITS> d_preamble_samples{};
+    std::array<int32_t, GPS_CA_PREAMBLE_LENGTH_SYMBOLS> d_preamble_samples{};
+    volatile int32_t res;  // Prevent the compiler from optimizing the loop away
     while (state.KeepRunning())
         {
-            std::generate(d_preamble_samples.begin(), d_preamble_samples.end(), [n = 0]() mutable { return (GPS_CA_PREAMBLE[n++] == '1' ? 1 : -1); });
+            std::generate(d_preamble_samples.begin(), d_preamble_samples.end(), [n = 0]() mutable { return (GPS_CA_PREAMBLE_SYMBOLS_STR[n++] == '1' ? 1 : -1); });
+            res = d_preamble_samples[GPS_CA_PREAMBLE_LENGTH_SYMBOLS - 1];
+        }
+    if (res > 1)
+        {
+            // Avoid unused-but-set-variable warning
         }
 }