diff --git a/Misc/NEWS b/Misc/NEWS
index d927f77fc6d..ecec86b4a53 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -123,6 +123,8 @@ Core and Builtins
 Library
 -------
 
+- Issue #18248: Fix libffi build on AIX.
+
 - Issue #18259: Declare sethostname in socketmodule.c for AIX
 
 - Issue #18147: Add diagnostic functions to ssl.SSLContext(). get_ca_list()
diff --git a/Modules/_ctypes/libffi.diff b/Modules/_ctypes/libffi.diff
index 71b1aa83eab..ade28e5f9e2 100644
--- a/Modules/_ctypes/libffi.diff
+++ b/Modules/_ctypes/libffi.diff
@@ -135,7 +135,7 @@ diff -r -N -u libffi.orig/configure.ac libffi/configure.ac
 +    'M32R': ['src/m32r/sysv.S', 'src/m32r/ffi.c'],
 +    'M68K': ['src/m68k/ffi.c', 'src/m68k/sysv.S'],
 +    'POWERPC': ['src/powerpc/ffi.c', 'src/powerpc/sysv.S', 'src/powerpc/ppc_closure.S', 'src/powerpc/linux64.S', 'src/powerpc/linux64_closure.S'],
-+    'POWERPC_AIX': ['src/powerpc/ffi.c', 'src/powerpc/aix.S', 'src/powerpc/aix_closure.S'],
++    'POWERPC_AIX': ['src/powerpc/ffi_darwin.c', 'src/powerpc/aix.S', 'src/powerpc/aix_closure.S'],
 +    'POWERPC_FREEBSD': ['src/powerpc/ffi.c', 'src/powerpc/sysv.S', 'src/powerpc/ppc_closure.S'],
 +    'ARM': ['src/arm/sysv.S', 'src/arm/ffi.c'],
 +    'LIBFFI_CRIS': ['src/cris/sysv.S', 'src/cris/ffi.c'],
diff --git a/Modules/_ctypes/libffi/fficonfig.py.in b/Modules/_ctypes/libffi/fficonfig.py.in
index 27c971f86f2..5a7fd083add 100644
--- a/Modules/_ctypes/libffi/fficonfig.py.in
+++ b/Modules/_ctypes/libffi/fficonfig.py.in
@@ -16,7 +16,7 @@ ffi_platforms = {
     'M32R': ['src/m32r/sysv.S', 'src/m32r/ffi.c'],
     'M68K': ['src/m68k/ffi.c', 'src/m68k/sysv.S'],
     'POWERPC': ['src/powerpc/ffi.c', 'src/powerpc/sysv.S', 'src/powerpc/ppc_closure.S', 'src/powerpc/linux64.S', 'src/powerpc/linux64_closure.S'],
-    'POWERPC_AIX': ['src/powerpc/ffi.c', 'src/powerpc/aix.S', 'src/powerpc/aix_closure.S'],
+    'POWERPC_AIX': ['src/powerpc/ffi_darwin.c', 'src/powerpc/aix.S', 'src/powerpc/aix_closure.S'],
     'POWERPC_FREEBSD': ['src/powerpc/ffi.c', 'src/powerpc/sysv.S', 'src/powerpc/ppc_closure.S'],
     'ARM': ['src/arm/sysv.S', 'src/arm/ffi.c'],
     'LIBFFI_CRIS': ['src/cris/sysv.S', 'src/cris/ffi.c'],