diff --git a/unittest/force-styles/test_main.h b/unittest/force-styles/test_main.h
index 8199537c39..6bcb24fb96 100644
--- a/unittest/force-styles/test_main.h
+++ b/unittest/force-styles/test_main.h
@@ -28,13 +28,13 @@ extern std::string INPUT_FOLDER;
 // convenience method to write out common entries
 void write_yaml_header(class YamlWriter *writer, TestConfig *cfg, const char *version);
 
-#define EXPECT_FP_LE_WITH_EPS(val1, val2, eps)                \
-    do {                                                      \
-        const double diff = fabs(val1 - val2);                \
-        const double div  = std::min(fabs(val1), fabs(val2)); \
-        const double err  = (div == 0.0) ? diff : diff / div; \
-        stats.add(err);                                       \
-        EXPECT_PRED_FORMAT2(::testing::DoubleLE, err, eps);   \
+#define EXPECT_FP_LE_WITH_EPS(val1, val2, eps)                  \
+    do {                                                        \
+        const double diff = fabs(val1 - val2);                  \
+        const double div  = std::min(fabs(val1), fabs(val2));   \
+        const double err = (div<DBL_EPSILON) ? diff : diff/div; \
+        stats.add(err);                                         \
+        EXPECT_PRED_FORMAT2(::testing::DoubleLE, err, eps);     \
     } while (0);
 
 void EXPECT_STRESS(const std::string &name, double *stress, const stress_t &expected_stress,