diff --git a/core/libs/prx/libc/src/StringExtensions.cpp b/core/libs/prx/libc/src/StringExtensions.cpp
index c15d39ef7..197546517 100644
--- a/core/libs/prx/libc/src/StringExtensions.cpp
+++ b/core/libs/prx/libc/src/StringExtensions.cpp
@@ -55,6 +55,12 @@ std::size_t APS5_VABI strlcat_nid_postfix(char* destination, const char* source,
     return destinationLength + sourceLength;
 }
 
+char* APS5_VABI stpcpy_nid_postfix(char* destination, const char* source) {
+    const auto length = std::strlen(source);
+    std::memcpy(destination, source, length + 1);
+    return destination + length;
+}
+
 char* APS5_VABI strtok_r_nid_postfix(char* text, const char* delimiters, char** state) {
     if (text == nullptr) text = *state;
     if (text == nullptr) return nullptr;
diff --git a/core/libs/tests/GuestStrings.cpp b/core/libs/tests/GuestStrings.cpp
index a2f688d7d..37bb9d2e5 100644
--- a/core/libs/tests/GuestStrings.cpp
+++ b/core/libs/tests/GuestStrings.cpp
@@ -13,6 +13,7 @@ char* APS5_VABI strncat_nid_postfix(char*, const char*, std::size_t);
 char* APS5_VABI strpbrk_nid_postfix(const char*, const char*);
 std::size_t APS5_VABI strcspn_nid_postfix(const char*, const char*);
 std::size_t APS5_VABI strlcat_nid_postfix(char*, const char*, std::size_t);
+char* APS5_VABI stpcpy_nid_postfix(char*, const char*);
 char* APS5_VABI strtok_r_nid_postfix(char*, const char*, char**);
 char* APS5_VABI strtok_nid_postfix(char*, const char*);
 char* APS5_VABI strcasestr_nid_postfix(const char*, const char*);
@@ -133,6 +134,12 @@ int main() {
     Require(strlcat_nid_postfix(buffer, "xyz", 0) == 3);
     buffer[0] = '\0';
     Require(strlcat_nid_postfix(buffer, "x", 1) == 1 && buffer[0] == '\0');
+    char chained[8] = "zzzzzzz";
+    char* end = stpcpy_nid_postfix(chained, "ab");
+    Require(end == chained + 2 && *end == '\0' && chained[3] == 'z');
+    end = stpcpy_nid_postfix(end, "cd");
+    Require(end == chained + 4 && std::strcmp(chained, "abcd") == 0);
+    Require(stpcpy_nid_postfix(end, "") == end && chained[5] == 'z');
     Require(strncat_nid_postfix(buffer, "xyz", 2) == buffer);
     Require(std::strcmp(buffer, "xy") == 0);
     Require(strpbrk_nid_postfix(buffer, "ay") == buffer + 1);