diff --git a/test/compare_to_eospac.cpp b/test/compare_to_eospac.cpp
index 5a4bfeb51cd..e1deb92fecc 100644
--- a/test/compare_to_eospac.cpp
+++ b/test/compare_to_eospac.cpp
@@ -547,7 +547,7 @@ int main(int argc, char *argv[]) {
             Real diff = tempSpiner_h(j, i) - t_true;
             tempDiff_h(j, i) = diff;
             const Real mean_t = 0.5 * diff + t_true;
-            if (isnan(diff)) {
+            if (std::isnan(diff)) {
               std::cout << "NAN! " << j << ", " << i << ", " << tempSpiner_h(j, i) << ", "
                         << tempEOSPAC(j, i) << ", " << mean_t << ", " << diff
                         << std::endl;
diff --git a/test/eos_unit_test_helpers.hpp b/test/eos_unit_test_helpers.hpp
index 3083ae48602..e11e6a7c72e 100644
--- a/test/eos_unit_test_helpers.hpp
+++ b/test/eos_unit_test_helpers.hpp
@@ -59,11 +59,11 @@ inline std::string demangle(const char *name) { return name; }
 #include <singularity-eos/eos/eos.hpp>
 
 PORTABLE_INLINE_FUNCTION bool isClose(Real a, Real b, Real eps = 5e-2) {
-  return fabs(b - a) / (fabs(a + b) + 1e-20) <= eps;
+  return std::abs(b - a) / (std::abs(a + b) + 1e-20) <= eps;
 }
 
 PORTABLE_INLINE_FUNCTION Real myAtan(Real x, Real shift, Real scale, Real offset) {
-  return scale * atan(x - shift) + offset;
+  return scale * std::atan(x - shift) + offset;
 }
 
 // Function for comparing arrays and outputting the important information