diff --git a/libc/bionic/dl_iterate_phdr_static.c b/libc/bionic/dl_iterate_phdr_static.c
index fc79ce5..d03d3d2 100644
--- a/libc/bionic/dl_iterate_phdr_static.c
+++ b/libc/bionic/dl_iterate_phdr_static.c
@@ -35,7 +35,7 @@
 extern void* __executable_start;
 
 int dl_iterate_phdr(int (*cb)(struct dl_phdr_info* info, size_t size, void* data), void* data) {
-    Elf32_Ehdr* ehdr = (Elf32_Ehdr*) &__executable_start;
+    Elf_Ehdr* ehdr = (Elf_Ehdr*) &__executable_start;
 
     // TODO: again, copied from linker.c. Find a better home for this later.
     if (ehdr->e_ident[EI_MAG0] != ELFMAG0) return -1;
@@ -51,7 +51,7 @@
     struct dl_phdr_info exe_info;
     exe_info.dlpi_addr = 0;
     exe_info.dlpi_name = NULL;
-    exe_info.dlpi_phdr = (Elf32_Phdr*) ((unsigned long) ehdr + ehdr->e_phoff);
+    exe_info.dlpi_phdr = (Elf_Phdr*) ((unsigned long) ehdr + ehdr->e_phoff);
     exe_info.dlpi_phnum = ehdr->e_phnum;
 
 #ifdef AT_SYSINFO_EHDR
@@ -62,15 +62,15 @@
     }
 
     // Try the VDSO if that didn't work.
-    Elf32_Ehdr* ehdr_vdso = (Elf32_Ehdr*) getauxval(AT_SYSINFO_EHDR);
+    Elf_Ehdr* ehdr_vdso = (Elf_Ehdr*) getauxval(AT_SYSINFO_EHDR);
     struct dl_phdr_info vdso_info;
     vdso_info.dlpi_addr = 0;
     vdso_info.dlpi_name = NULL;
-    vdso_info.dlpi_phdr = (Elf32_Phdr*) ((char*) ehdr_vdso + ehdr_vdso->e_phoff);
+    vdso_info.dlpi_phdr = (Elf_Phdr*) ((char*) ehdr_vdso + ehdr_vdso->e_phoff);
     vdso_info.dlpi_phnum = ehdr_vdso->e_phnum;
     for (size_t i = 0; i < vdso_info.dlpi_phnum; ++i) {
         if (vdso_info.dlpi_phdr[i].p_type == PT_LOAD) {
-            vdso_info.dlpi_addr = (Elf32_Addr) ehdr_vdso - vdso_info.dlpi_phdr[i].p_vaddr;
+            vdso_info.dlpi_addr = (Elf_Addr) ehdr_vdso - vdso_info.dlpi_phdr[i].p_vaddr;
             break;
         }
     }
diff --git a/libc/bionic/getauxval.cpp b/libc/bionic/getauxval.cpp
index fd225e0..3ee31d6 100644
--- a/libc/bionic/getauxval.cpp
+++ b/libc/bionic/getauxval.cpp
@@ -32,10 +32,10 @@
 #include <private/bionic_auxv.h>
 #include <elf.h>
 
-__LIBC_HIDDEN__ Elf32_auxv_t* __libc_auxv = NULL;
+__LIBC_HIDDEN__ Elf_auxv_t* __libc_auxv = NULL;
 
 extern "C" unsigned long int getauxval(unsigned long int type) {
-  for (Elf32_auxv_t* v = __libc_auxv; v->a_type != AT_NULL; ++v) {
+  for (Elf_auxv_t* v = __libc_auxv; v->a_type != AT_NULL; ++v) {
     if (v->a_type == type) {
       return v->a_un.a_val;
     }
diff --git a/libc/bionic/libc_init_static.cpp b/libc/bionic/libc_init_static.cpp
index a6b20eb..a60e414 100644
--- a/libc/bionic/libc_init_static.cpp
+++ b/libc/bionic/libc_init_static.cpp
@@ -67,16 +67,16 @@
 }
 
 static void apply_gnu_relro() {
-  Elf32_Phdr* phdr_start = reinterpret_cast<Elf32_Phdr*>(getauxval(AT_PHDR));
+  Elf_Phdr* phdr_start = reinterpret_cast<Elf_Phdr*>(getauxval(AT_PHDR));
   unsigned long int phdr_ct = getauxval(AT_PHNUM);
 
-  for (Elf32_Phdr* phdr = phdr_start; phdr < (phdr_start + phdr_ct); phdr++) {
+  for (Elf_Phdr* phdr = phdr_start; phdr < (phdr_start + phdr_ct); phdr++) {
     if (phdr->p_type != PT_GNU_RELRO) {
       continue;
     }
 
-    Elf32_Addr seg_page_start = PAGE_START(phdr->p_vaddr);
-    Elf32_Addr seg_page_end = PAGE_END(phdr->p_vaddr + phdr->p_memsz);
+    Elf_Addr seg_page_start = PAGE_START(phdr->p_vaddr);
+    Elf_Addr seg_page_end = PAGE_END(phdr->p_vaddr + phdr->p_memsz);
 
     // Check return value here? What do we do if we fail?
     mprotect(reinterpret_cast<void*>(seg_page_start), seg_page_end - seg_page_start, PROT_READ);
diff --git a/libc/include/elf.h b/libc/include/elf.h
index ac0f1d2..285eb7d 100644
--- a/libc/include/elf.h
+++ b/libc/include/elf.h
@@ -46,5 +46,10 @@
   } a_un;
 } Elf64_auxv_t;
 
-#endif /* _ELF_H */
+#ifdef __LP64__
+#  define Elf_auxv_t Elf64_auxv_t
+#else
+#  define Elf_auxv_t Elf32_auxv_t
+#endif
 
+#endif /* _ELF_H */
diff --git a/libc/include/link.h b/libc/include/link.h
index 0edf5df..341fbf1 100644
--- a/libc/include/link.h
+++ b/libc/include/link.h
@@ -33,8 +33,7 @@
 
 __BEGIN_DECLS
 
-/* bionic is currently only 32-bit. */
-#define ElfW(type) Elf32_##type
+#define ElfW(type) Elf_##type
 
 struct dl_phdr_info {
   ElfW(Addr) dlpi_addr;
diff --git a/libc/private/KernelArgumentBlock.h b/libc/private/KernelArgumentBlock.h
index 14eca06..105965e 100644
--- a/libc/private/KernelArgumentBlock.h
+++ b/libc/private/KernelArgumentBlock.h
@@ -30,7 +30,7 @@
 class KernelArgumentBlock {
  public:
   KernelArgumentBlock(void* raw_args) {
-    uint32_t* args = reinterpret_cast<uint32_t*>(raw_args);
+    uintptr_t* args = reinterpret_cast<uintptr_t*>(raw_args);
     argc = static_cast<int>(*args);
     argv = reinterpret_cast<char**>(args + 1);
     envp = argv + argc + 1;
@@ -43,14 +43,14 @@
     }
     ++p; // Skip second NULL;
 
-    auxv = reinterpret_cast<Elf32_auxv_t*>(p);
+    auxv = reinterpret_cast<Elf_auxv_t*>(p);
   }
 
   // Similar to ::getauxval but doesn't require the libc global variables to be set up,
   // so it's safe to call this really early on. This function also lets you distinguish
   // between the inability to find the given type and its value just happening to be 0.
   unsigned long getauxval(unsigned long type, bool* found_match = NULL) {
-    for (Elf32_auxv_t* v = auxv; v->a_type != AT_NULL; ++v) {
+    for (Elf_auxv_t* v = auxv; v->a_type != AT_NULL; ++v) {
       if (v->a_type == type) {
         if (found_match != NULL) {
             *found_match = true;
@@ -67,7 +67,7 @@
   int argc;
   char** argv;
   char** envp;
-  Elf32_auxv_t* auxv;
+  Elf_auxv_t* auxv;
 
   abort_msg_t** abort_message_ptr;
 
diff --git a/libc/private/bionic_auxv.h b/libc/private/bionic_auxv.h
index 23b2e37..69c5341 100644
--- a/libc/private/bionic_auxv.h
+++ b/libc/private/bionic_auxv.h
@@ -33,7 +33,7 @@
 
 __BEGIN_DECLS
 
-extern Elf32_auxv_t* __libc_auxv;
+extern Elf_auxv_t* __libc_auxv;
 
 __END_DECLS