diff --git a/libc/config/linux/api.td b/libc/config/linux/api.td
--- a/libc/config/linux/api.td
+++ b/libc/config/linux/api.td
@@ -209,7 +209,7 @@
 }
 
 def SysResourceAPI : PublicAPI<"sys/resource.h"> {
-  let Types = ["rlim_t", "struct rlimit"];
+  let Types = ["rlim_t", "struct rlimit", "rlim64_t", "struct rlimit64"];
 }
 
 def SysStatAPI : PublicAPI<"sys/stat.h"> {
diff --git a/libc/include/CMakeLists.txt b/libc/include/CMakeLists.txt
--- a/libc/include/CMakeLists.txt
+++ b/libc/include/CMakeLists.txt
@@ -340,6 +340,8 @@
     .llvm-libc-macros.sys_resource_macros
     .llvm-libc-types.rlim_t
     .llvm-libc-types.struct_rlimit
+    .llvm-libc-types.rlim64_t
+    .llvm-libc-types.struct_rlimit64
 )
 
 add_gen_header(
diff --git a/libc/include/llvm-libc-types/CMakeLists.txt b/libc/include/llvm-libc-types/CMakeLists.txt
--- a/libc/include/llvm-libc-types/CMakeLists.txt
+++ b/libc/include/llvm-libc-types/CMakeLists.txt
@@ -54,11 +54,13 @@
 add_header(pthread_mutexattr_t HDR pthread_mutexattr_t.h)
 add_header(pthread_once_t HDR pthread_once_t.h DEPENDS .__futex_word)
 add_header(rlim_t HDR rlim_t.h)
+add_header(rlim64_t HDR rlim64_t.h)
 add_header(time_t HDR time_t.h)
 add_header(stack_t HDR stack_t.h)
 add_header(suseconds_t HDR suseconds_t.h)
 add_header(struct_timeval HDR struct_timeval.h DEPENDS .suseconds_t .time_t)
 add_header(struct_rlimit HDR struct_rlimit.h DEPENDS .rlim_t)
+add_header(struct_rlimit64 HDR struct_rlimit64.h DEPENDS .rlim64_t)
 add_header(struct_rusage HDR struct_rusage.h DEPENDS .struct_timeval)
 add_header(struct_dirent HDR struct_dirent.h DEPENDS .ino_t .off_t)
 add_header(struct_sched_param HDR struct_sched_param.h)
diff --git a/libc/include/llvm-libc-types/rlim64_t.h b/libc/include/llvm-libc-types/rlim64_t.h
new file mode 100644
--- /dev/null
+++ b/libc/include/llvm-libc-types/rlim64_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of type rlim64_t ---------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __LLVM_LIBC_TYPES_RLIM64_T_H__
+#define __LLVM_LIBC_TYPES_RLIM64_T_H__
+
+typedef __UINT64_TYPE__ rlim64_t;
+
+#endif // __LLVM_LIBC_TYPES_RLIM64_T_H__
diff --git a/libc/include/llvm-libc-types/struct_rlimit64.h b/libc/include/llvm-libc-types/struct_rlimit64.h
new file mode 100644
--- /dev/null
+++ b/libc/include/llvm-libc-types/struct_rlimit64.h
@@ -0,0 +1,19 @@
+//===-- Definition of type struct rlimit64 --------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __LLVM_LIBC_TYPES_STRUCT_RLIMIT64_H__
+#define __LLVM_LIBC_TYPES_STRUCT_RLIMIT64_H__
+
+#include <llvm-libc-types/rlim64_t.h>
+
+struct rlimit64 {
+  rlim64_t rlim_cur;
+  rlim64_t rlim_max;
+};
+
+#endif // __LLVM_LIBC_TYPES_STRUCT_RLIMIT64_H__
diff --git a/libc/spec/posix.td b/libc/spec/posix.td
--- a/libc/spec/posix.td
+++ b/libc/spec/posix.td
@@ -767,12 +767,14 @@
 
   NamedType RLimTType = NamedType<"rlim_t">;
   NamedType StructRLimitType = NamedType<"struct rlimit">;
+  NamedType RLim64TType = NamedType<"rlim64_t">;
+  NamedType StructRLimit64Type = NamedType<"struct rlimit64">;
   PtrType StructRLimitPtr = PtrType<StructRLimitType>;
   ConstType ConstStructRLimitPtr = ConstType<StructRLimitType>;
   HeaderSpec SysResource = HeaderSpec<
     "sys/resource.h",
     [], // Macros
-    [RLimTType, StructRLimitType], // Types
+    [RLimTType, StructRLimitType, RLim64TType, StructRLimit64Type], // Types
     [], // Enumerations
     [
         FunctionSpec<
diff --git a/libc/src/sys/resource/linux/getrlimit.cpp b/libc/src/sys/resource/linux/getrlimit.cpp
--- a/libc/src/sys/resource/linux/getrlimit.cpp
+++ b/libc/src/sys/resource/linux/getrlimit.cpp
@@ -18,12 +18,26 @@
 namespace __llvm_libc {
 
 LLVM_LIBC_FUNCTION(int, getrlimit, (int res, struct rlimit *limits)) {
+#if defined(LIBC_TARGET_ARCH_IS_RISCV32) || defined(LIBC_TARGET_ARCH_IS_ARM32)
+  // SYS_prlimit64 takes a rlimit64 struct, which is a struct rlimit with
+  // 64-bit members. In 32-bit systems struct rlimit has 32-bit members, so
+  // we need to fill a rlimit64 struct with the 32-bit values from struct rlimit
+  struct rlimit64 lim;
+#else
+  struct rlimit lim;
+#endif
+  lim.rlim_cur = limits->rlim_cur;
+  lim.rlim_max = limits->rlim_max;
+
   int ret =
-      __llvm_libc::syscall_impl<int>(SYS_prlimit64, 0, res, nullptr, limits);
+      __llvm_libc::syscall_impl<int>(SYS_prlimit64, 0, res, nullptr, &lim);
   if (ret < 0) {
     libc_errno = -ret;
     return -1;
   }
+
+  limits->rlim_cur = static_cast<rlim_t>(lim.rlim_cur);
+  limits->rlim_max = static_cast<rlim_t>(lim.rlim_max);
   return 0;
 }
 
diff --git a/libc/src/sys/resource/linux/setrlimit.cpp b/libc/src/sys/resource/linux/setrlimit.cpp
--- a/libc/src/sys/resource/linux/setrlimit.cpp
+++ b/libc/src/sys/resource/linux/setrlimit.cpp
@@ -18,8 +18,19 @@
 namespace __llvm_libc {
 
 LLVM_LIBC_FUNCTION(int, setrlimit, (int res, const struct rlimit *limits)) {
+#if defined(LIBC_TARGET_ARCH_IS_RISCV32) || defined(LIBC_TARGET_ARCH_IS_ARM32)
+  // SYS_prlimit64 takes a rlimit64 struct, which is a struct rlimit with
+  // 64-bit members. In 32-bit systems struct rlimit has 32-bit members, so
+  // we need to fill a rlimit64 struct with the 32-bit values from struct rlimit
+  struct rlimit64 lim;
+#else
+  struct rlimit lim;
+#endif
+  lim.rlim_cur = limits->rlim_cur;
+  lim.rlim_max = limits->rlim_max;
+
   int ret =
-      __llvm_libc::syscall_impl<int>(SYS_prlimit64, 0, res, limits, nullptr);
+      __llvm_libc::syscall_impl<int>(SYS_prlimit64, 0, res, &lim, nullptr);
   if (ret < 0) {
     libc_errno = -ret;
     return -1;