diff --git a/src/include/units/math.h b/src/include/units/math.h
index 745be47e..497c4dbd 100644
--- a/src/include/units/math.h
+++ b/src/include/units/math.h
@@ -59,12 +59,6 @@ constexpr Quantity AUTO abs(const quantity<D, U, Rep>& q) noexcept
   return quantity<D, U, Rep>(std::abs(q.count()));
 }
 
-template<typename D, typename U, typename Rep>
-constexpr Quantity AUTO fabs(const quantity<D, U, Rep>& q) noexcept
-{
-  return quantity<D, U, Rep>(std::fabs(q.count()));
-}
-
 template<Quantity Q>
 constexpr Quantity AUTO epsilon() noexcept
 {
diff --git a/test/unit_test/runtime/math_test.cpp b/test/unit_test/runtime/math_test.cpp
index 74c3b48c..617c1e5f 100644
--- a/test/unit_test/runtime/math_test.cpp
+++ b/test/unit_test/runtime/math_test.cpp
@@ -56,20 +56,30 @@ TEST_CASE("'sqrt()' on quantity changes the value and the dimension accordingly"
 
 TEST_CASE("absolute functions on quantity returns the absolute value", "[math][abs][fabs]")
 {
-  SECTION ("'abs()' on a negative quantity returns the abs") {
-    REQUIRE(abs(-1q_m) == 1q_m);
+  SECTION ("'abs()' on a negative quantity returns the abs")
+  {
+    SECTION ("integral representation")
+    {
+      REQUIRE(abs(-1q_m) == 1q_m);
+    }
+
+    SECTION ("floating-point representation")
+    {
+      REQUIRE(abs(-1.q_m) == 1q_m);
+    }
   }
 
-  SECTION ("'abs()' on a positive quantity returns the abs") {
-    REQUIRE(abs(1q_m) == 1q_m);
-  }
+  SECTION ("'abs()' on a positive quantity returns the abs")
+  {
+    SECTION ("integral representation")
+    {
+      REQUIRE(abs(1q_m) == 1q_m);
+    }
 
-  SECTION ("'fabs()' on a negative quantity returns the abs") {
-    REQUIRE(fabs(-1.q_m) == 1.q_m);
-  }
-
-  SECTION ("'fabs()' on a positive quantity returns the abs") {
-    REQUIRE(fabs(1.q_m) == 1.q_m);
+    SECTION ("floating-point representation")
+    {
+      REQUIRE(abs(1.q_m) == 1q_m);
+    }
   }
 }