diff --git a/tests/C-tests/add_matrix_typed.c b/tests/C-tests/add_matrix_typed.c
index bc873ea32..619b7b133 100644
--- a/tests/C-tests/add_matrix_typed.c
+++ b/tests/C-tests/add_matrix_typed.c
@@ -6,7 +6,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #if defined(SINGLE_REAL) || defined(SINGLE_COMPLEX)
-#define REL_TOL 1e-6
+#define REL_TOL 2e-6
 #else
 #define REL_TOL 1e-12
 #endif
@@ -30,33 +30,44 @@ int TYPED_FUNC(
     double beta = 0.8;
     double threshold = 0.0;
 
-    LOG_DEBUG("rel. tolerance = %e\n", REL_TOL);
+    LOG_INFO("rel. tolerance = %e\n", REL_TOL);
 
     A = bml_random_matrix(matrix_type, matrix_precision, N, M, sequential);
     B = bml_copy_new(A);
     C = bml_random_matrix(matrix_type, matrix_precision, N, M, sequential);
 
+    LOG_INFO("A\n");
+    bml_print_bml_matrix(A, 0, N, 0, N);
+    LOG_INFO("B\n");
+    bml_print_bml_matrix(B, 0, N, 0, N);
+    LOG_INFO("C\n");
+    bml_print_bml_matrix(C, 0, N, 0, N);
+
     bml_add(B, C, alpha, beta, threshold);
 
     A_dense = bml_export_to_dense(A, dense_row_major);
     B_dense = bml_export_to_dense(B, dense_row_major);
     C_dense = bml_export_to_dense(C, dense_row_major);
+
+    LOG_INFO("A_dense\n");
     bml_print_dense_matrix(N, matrix_precision, dense_row_major, A_dense, 0,
                            N, 0, N);
+    LOG_INFO("B_dense\n");
     bml_print_dense_matrix(N, matrix_precision, dense_row_major, B_dense, 0,
                            N, 0, N);
+    LOG_INFO("C_dense\n");
     bml_print_dense_matrix(N, matrix_precision, dense_row_major, C_dense, 0,
                            N, 0, N);
     for (int i = 0; i < N * N; i++)
     {
         double expected = alpha * A_dense[i] + beta * C_dense[i];
-        double rel_diff_val = (expected - B_dense[i]) / expected;
-        double rel_diff = fabs(rel_diff_val);
+        double abs_diff = fabs(expected - B_dense[i]);
+        double rel_diff = abs_diff / expected;
         if (rel_diff > REL_TOL)
         {
             LOG_ERROR
-                ("matrices are not identical; expected[%d] = %e, B[%d] = %e\n",
-                 i, expected, i, B_dense[i]);
+                ("matrices are not identical; expected[%d] = %e, B[%d] = %e, abs. diff = %e, |rel. diff| = %e\n",
+                 i, expected, i, B_dense[i], abs_diff, rel_diff);
             return -1;
         }
     }