diff --git a/nx/include/switch/kernel/svc.h b/nx/include/switch/kernel/svc.h
index 625537f9..9b377d33 100644
--- a/nx/include/switch/kernel/svc.h
+++ b/nx/include/switch/kernel/svc.h
@@ -720,7 +720,7 @@ Result svcSetProcessMemoryPermission(Handle proc, u64 addr, u64 size, u32 perm);
  * @brief Maps the src address from the supplied process handle into the current process.
  * @param[in] dst Address to which map the memory in the current process.
  * @param[in] proc Process handle.
- * @param[in] src Address of the memory in the process.
+ * @param[in] src Source mapping address.
  * @param[in] size Size of the memory.
  * @return Result code.
  * @remark This allows mapping code and rodata with RW- permission.
@@ -729,6 +729,19 @@ Result svcSetProcessMemoryPermission(Handle proc, u64 addr, u64 size, u32 perm);
  */
 Result svcMapProcessMemory(void* dst, Handle proc, u64 src, u64 size);
 
+/**
+ * @brief Undoes the effects of \ref svcMapProcessMemory.
+ * @param[in] dst Destination mapping address
+ * @param[in] proc Process handle.
+ * @param[in] src Address of the memory in the process.
+ * @param[in] size Size of the memory.
+ * @return Result code.
+ * @remark This allows mapping code and rodata with RW- permission.
+ * @note Syscall number 0x75.
+ * @warning This is a privileged syscall. Use \ref envIsSyscallHinted to check if it is available.
+ */
+Result svcUnmapProcessMemory(void* dst, Handle proc, u64 src, u64 size);
+
 /**
  * @brief Maps normal heap in a certain process as executable code (used when loading NROs).
  * @param[in] proc Process handle (cannot be \ref CUR_PROCESS_HANDLE).
diff --git a/nx/source/kernel/svc.s b/nx/source/kernel/svc.s
index d338a5ba..b60b3cd9 100644
--- a/nx/source/kernel/svc.s
+++ b/nx/source/kernel/svc.s
@@ -382,6 +382,11 @@ SVC_BEGIN svcMapProcessMemory
 	ret
 SVC_END
 
+SVC_BEGIN svcUnmapProcessMemory
+	svc 0x75
+	ret
+SVC_END
+
 SVC_BEGIN svcMapProcessCodeMemory
 	svc 0x77
 	ret