diff --git a/test_conformance/printf/test_printf.cpp b/test_conformance/printf/test_printf.cpp
index ef52f044..380878cb 100644
--- a/test_conformance/printf/test_printf.cpp
+++ b/test_conformance/printf/test_printf.cpp
@@ -317,8 +317,10 @@ cl_program makeMixedFormatPrintfProgram(cl_kernel* kernel_ptr,
         {
             const float max_range = 100000.f;
             float arg = get_random_float(-max_range, max_range, gMTdata);
-            args_str << str_sprintf("%f", arg) << "f, ";
-            ref_str << str_sprintf(format, arg) << ", ";
+            std::string arg_str = str_sprintf("%f", arg);
+            args_str << arg_str << "f, ";
+            float arg_deviceRound = std::stof(arg_str);
+            ref_str << str_sprintf(format, arg_deviceRound) << ", ";
         }
     }
     // Restore the original CPU rounding mode
diff --git a/test_conformance/printf/util_printf.cpp b/test_conformance/printf/util_printf.cpp
index cd84c01a..803f13ab 100644
--- a/test_conformance/printf/util_printf.cpp
+++ b/test_conformance/printf/util_printf.cpp
@@ -1336,6 +1336,33 @@ std::vector<std::string> correctBufferVector = {
     "00512,01024,262144,1048576"
 };
 
+std::vector<std::string> correctBufferVectorRTZ = {
+
+    "1.00,2.00,3.00,4.00",
+
+    "0xfa,0xfb",
+
+    "0x1234,0x8765",
+
+    "0x12345678,0x87654321",
+
+    "12345678,98765432",
+
+    "1.00,2.00,3.00,4.00",
+
+    "1.23e+03,9.87e+05,4.99e-04",
+
+    "0x1p-2,0x1p-1,0x1p+0,0x1.8p+0",
+
+    "1,2,3,4,1.5,3.13999,2.5,3.5",
+
+    "1,2,3,4,5,6,7,10,11,0,40,100,200,400,1000,2000",
+
+    "+1,-2,+3,-4,+5,-6,+7,-8",
+
+    "00512,01024,262144,1048576"
+};
+
 //-----------------------------------------------------------
 
 //Test case for vector                                      |
@@ -1822,7 +1849,14 @@ void generateRef(const cl_device_id device)
             as they're constant and hard-coded
         */
         if (caseToTest->printFN == NULL)
+        {
+            if (caseToTest->_type == TYPE_VECTOR
+                && fpConfigSingle == CL_FP_ROUND_TO_ZERO)
+            {
+                caseToTest->_correctBuffer = correctBufferVectorRTZ;
+            }
             continue;
+        }
 
         // Make sure the reference result is empty
         assert(caseToTest->_correctBuffer.size() == 0);