diff --git a/test/acm_random.h b/test/acm_random.h
index 8b1d51a..742224a 100644
--- a/test/acm_random.h
+++ b/test/acm_random.h
@@ -37,6 +37,8 @@
     return (value >> 15) & 0xffff;
   }
 
+  int16_t Rand16Signed(void) { return static_cast<int16_t>(Rand16()); }
+
   int16_t Rand15Signed(void) {
     const uint32_t value =
         random_.Generate(testing::internal::Random::kMaxRange);
diff --git a/test/av1_quantize_test.cc b/test/av1_quantize_test.cc
index 731e99c..5823647 100644
--- a/test/av1_quantize_test.cc
+++ b/test/av1_quantize_test.cc
@@ -79,8 +79,8 @@
       }
 
       for (int j = 0; j < 2; j++) {
-        zbin_ptr[j] = rnd.Rand16();
-        quant_shift_ptr[j] = rnd.Rand16();
+        zbin_ptr[j] = rnd.Rand16Signed();
+        quant_shift_ptr[j] = rnd.Rand16Signed();
         // int16_t positive
         dequant_ptr[j] = abs(rnd(dequantRange));
         quant_ptr[j] = static_cast<int16_t>((1 << 16) / dequant_ptr[j]);
@@ -155,8 +155,8 @@
       coeff_ptr[rnd(count)] = rnd(coeffRange);
 
       for (int j = 0; j < 2; j++) {
-        zbin_ptr[j] = rnd.Rand16();
-        quant_shift_ptr[j] = rnd.Rand16();
+        zbin_ptr[j] = rnd.Rand16Signed();
+        quant_shift_ptr[j] = rnd.Rand16Signed();
         // int16_t positive
         dequant_ptr[j] = abs(rnd(dequantRange));
         quant_ptr[j] = (1 << 16) / dequant_ptr[j];
diff --git a/test/av1_wedge_utils_test.cc b/test/av1_wedge_utils_test.cc
index a51ce12..369479a 100644
--- a/test/av1_wedge_utils_test.cc
+++ b/test/av1_wedge_utils_test.cc
@@ -341,7 +341,7 @@
 
   for (int iter = 0; iter < kIterations && !HasFatalFailure(); ++iter) {
     for (int i = 0; i < MAX_SB_SQUARE; ++i) {
-      a[i] = rng_.Rand16();
+      a[i] = rng_.Rand16Signed();
       b[i] = rng_(2 * INT16_MAX + 1) - INT16_MAX;
     }