diff --git a/core/libs/prx/libSceAgcDriver/Execution/src/Pm4.cpp b/core/libs/prx/libSceAgcDriver/Execution/src/Pm4.cpp
index 9dfdfad7b..4b72ec3c5 100644
--- a/core/libs/prx/libSceAgcDriver/Execution/src/Pm4.cpp
+++ b/core/libs/prx/libSceAgcDriver/Execution/src/Pm4.cpp
@@ -196,6 +196,7 @@ std::string_view UnsupportedReason(std::uint32_t header) {
 
 constexpr std::uint32_t DmaSourceCachePolicy = 3u << 13u;
 constexpr std::uint32_t DmaDestinationCachePolicy = 3u << 25u;
+constexpr std::uint32_t WriteDataCachePolicy = 3u << 25u;
 
 void Validate(std::span<const std::uint32_t> packet, std::uint32_t queue) {
     require(!packet.empty(), "truncated PM4 header");
@@ -380,7 +381,7 @@ void Validate(std::span<const std::uint32_t> packet, std::uint32_t queue) {
             break;
         case 0x37: {
             require(packet.size() >= 5, "WRITE_DATA has no data");
-            require((packet[1] & ~0x40110f00u) == 0, "WRITE_DATA engine, cache or reserved fields are not implemented");
+            require((packet[1] & ~(0x40110f00u | WriteDataCachePolicy)) == 0, "WRITE_DATA engine or reserved fields are not implemented");
             const auto destination = (packet[1] >> 8u) & 0xfu;
             require(destination == 1 || destination == 2 || (queue != 0 && destination == 5), "WRITE_DATA register or GDS destination is not implemented");
             require((packet[2] & 3u) == 0, "misaligned WRITE_DATA destination");
diff --git a/core/libs/prx/libSceAgcDriver/tests/Pm4.cpp b/core/libs/prx/libSceAgcDriver/tests/Pm4.cpp
index 4c559fc5f..9195aa78c 100644
--- a/core/libs/prx/libSceAgcDriver/tests/Pm4.cpp
+++ b/core/libs/prx/libSceAgcDriver/tests/Pm4.cpp
@@ -290,6 +290,9 @@ void testMemory() {
     check(data[0] == 22 && data[1] == 12, "WRITE_DATA fixed destination failed");
     execute(state, makePacket(0x37, {0x40000100, low(data.data()), high(data.data()), 41, 42}));
     check(data[0] == 41 && data[1] == 42, "WRITE_DATA from the PFP failed");
+    execute(state, makePacket(0x37, {0x04100200, low(data.data()), high(data.data()), 61, 62}));
+    check(data[0] == 61 && data[1] == 62, "WRITE_DATA with a cache policy failed");
+    expectFailure([&] { AgcDriver::Pm4::Validate(makePacket(0x37, {0x08000100, low(data.data()), high(data.data()), 71}), 0); }, "reserved");
     expectFailure([&] { AgcDriver::Pm4::Validate(makePacket(0x37, {0x80000100, low(data.data()), high(data.data()), 51}), 0); }, "engine");
     execute(state, makePacket(0x81, {4, 31, 32}));
     execute(state, makePacket(0x83, {4, 2, low(data.data()), high(data.data())}));