diff --git a/tests/test-quantize-fns.cpp b/tests/test-quantize-fns.cpp
index 7e091e8c4..2fea72d94 100644
--- a/tests/test-quantize-fns.cpp
+++ b/tests/test-quantize-fns.cpp
@@ -36,7 +36,7 @@ float array_rmse(const float * a1, const float * a2, size_t n) {
 
 // Total quantization error on test data
 float total_quantization_error(quantize_fns_t & qfns, size_t test_size, const float * test_data) {
-    std::vector<uint8_t> tmp_q(test_size);
+    std::vector<uint8_t> tmp_q(2*test_size);
     std::vector<float> tmp_out(test_size);
 
     qfns.quantize_row_q(test_data, tmp_q.data(), test_size);
@@ -46,7 +46,7 @@ float total_quantization_error(quantize_fns_t & qfns, size_t test_size, const fl
 
 // Total quantization error on test data
 float reference_quantization_error(quantize_fns_t & qfns, size_t test_size, const float * test_data) {
-    std::vector<uint8_t> tmp_q(test_size);
+    std::vector<uint8_t> tmp_q(2*test_size);
     std::vector<float> tmp_out(test_size);
     std::vector<float> tmp_out_ref(test_size);
 
@@ -69,8 +69,8 @@ float dot_product(const float * a1, const float * a2, size_t test_size) {
 
 // Total dot product error
 float dot_product_error(quantize_fns_t & qfns, size_t test_size, const float * test_data1, const float *test_data2) {
-    std::vector<uint8_t> tmp_q1(test_size);
-    std::vector<uint8_t> tmp_q2(test_size*2);
+    std::vector<uint8_t> tmp_q1(2*test_size);
+    std::vector<uint8_t> tmp_q2(2*test_size);
 
     qfns.quantize_row_q(test_data1, tmp_q1.data(), test_size);
     qfns.quantize_row_q_dot(test_data2, tmp_q2.data(), test_size);