diff --git a/openair1/PHY/TOOLS/tests/CMakeLists.txt b/openair1/PHY/TOOLS/tests/CMakeLists.txt
index 591dfcd430..2b846a8cd3 100644
--- a/openair1/PHY/TOOLS/tests/CMakeLists.txt
+++ b/openair1/PHY/TOOLS/tests/CMakeLists.txt
@@ -14,4 +14,4 @@ add_executable(test_log2_approx test_log2_approx.cpp ../log2_approx.c)
 target_link_libraries(test_log2_approx PRIVATE GTest::gtest LOG minimal_lib)
 add_dependencies(tests test_log2_approx)
 add_test(NAME test_log2_approx
-  COMMAND ./test_log2_approx)
+  COMMAND ./test_log2_approx --gtest_filter=-log2_approx.complete)
diff --git a/openair1/PHY/TOOLS/tests/test_log2_approx.cpp b/openair1/PHY/TOOLS/tests/test_log2_approx.cpp
index c05540b61c..6728041c52 100644
--- a/openair1/PHY/TOOLS/tests/test_log2_approx.cpp
+++ b/openair1/PHY/TOOLS/tests/test_log2_approx.cpp
@@ -10,25 +10,27 @@ uint8_t log2_approx_ref(uint32_t x)
   return std::round(std::log2(x));
 }
 
-uint8_t log2_approx64_ref(unsigned long long int x)
-{
-  return std::round(std::log2(static_cast<long double>(x)));
-}
-
 TEST(log2_approx, complete)
 {
   for (uint32_t i = 0; i < UINT32_MAX; i++)
     EXPECT_EQ(log2_approx(i), log2_approx_ref(i));
 }
 
+TEST(log2_approx, boundaries)
+{
+  for (int i = 0; i < 32; i++) {
+    uint32_t i2 = std::pow(2.0, i + 0.5);
+    EXPECT_EQ(log2_approx(i2), i) << "log2(" << i2 << ")";
+    EXPECT_EQ(log2_approx(i2 + 1), i + 1) << "log2(" << i2 + 1 << ")";
+  }
+}
+
 TEST(log2_approx64, boundaries)
 {
-  for (long double i = 0; i < 64; i++) {
-    unsigned long long i2 = std::pow(2.0L, i + 0.5L);
-    for (unsigned long long j = -10; j <= 10; j++) {
-      unsigned long long x = i2 + j;
-      EXPECT_EQ(log2_approx64(x), log2_approx64_ref(x));
-    }
+  for (int i = 0; i < 64; i++) {
+    unsigned long long int i2 = std::pow(2.0L, i + 0.5L);
+    EXPECT_EQ(log2_approx64(i2), i) << "log2(" << i2 << ")";
+    EXPECT_EQ(log2_approx64(i2 + 1), i + 1) << "log2(" << i2 + 1 << ")";
   }
 }