diff --git a/backends/Makefile.objs b/backends/Makefile.objs
index ad7c0325ed..717fcbdae4 100644
--- a/backends/Makefile.objs
+++ b/backends/Makefile.objs
@@ -4,7 +4,7 @@ common-obj-$(CONFIG_POSIX) += rng-random.o
 common-obj-$(CONFIG_TPM) += tpm.o
 
 common-obj-y += hostmem.o hostmem-ram.o
-common-obj-$(CONFIG_LINUX) += hostmem-file.o
+common-obj-$(CONFIG_POSIX) += hostmem-file.o
 
 common-obj-y += cryptodev.o
 common-obj-y += cryptodev-builtin.o
diff --git a/backends/hostmem-file.c b/backends/hostmem-file.c
index 2476dcb435..e64074954f 100644
--- a/backends/hostmem-file.c
+++ b/backends/hostmem-file.c
@@ -51,7 +51,7 @@ file_backend_memory_alloc(HostMemoryBackend *backend, Error **errp)
         error_setg(errp, "mem-path property not set");
         return;
     }
-#ifndef CONFIG_LINUX
+#ifndef CONFIG_POSIX
     error_setg(errp, "-mem-path not supported on this host");
 #else
     if (!host_memory_backend_mr_inited(backend)) {
diff --git a/exec.c b/exec.c
index 6826c8337d..d0821e69aa 100644
--- a/exec.c
+++ b/exec.c
@@ -1734,7 +1734,7 @@ long qemu_getrampagesize(void)
 }
 #endif
 
-#ifdef __linux__
+#ifdef CONFIG_POSIX
 static int64_t get_file_size(int fd)
 {
     int64_t size = lseek(fd, 0, SEEK_END);
@@ -2230,7 +2230,7 @@ static void ram_block_add(RAMBlock *new_block, Error **errp, bool shared)
     }
 }
 
-#ifdef __linux__
+#ifdef CONFIG_POSIX
 RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr,
                                  uint32_t ram_flags, int fd,
                                  Error **errp)
diff --git a/include/exec/memory.h b/include/exec/memory.h
index eb4f2fb249..e78a9a4f48 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -633,7 +633,7 @@ void memory_region_init_resizeable_ram(MemoryRegion *mr,
                                                        uint64_t length,
                                                        void *host),
                                        Error **errp);
-#ifdef __linux__
+#ifdef CONFIG_POSIX
 
 /**
  * memory_region_init_ram_from_file:  Initialize RAM memory region with a
diff --git a/memory.c b/memory.c
index aceadb2bf8..f797d82dd1 100644
--- a/memory.c
+++ b/memory.c
@@ -1557,7 +1557,7 @@ void memory_region_init_resizeable_ram(MemoryRegion *mr,
     }
 }
 
-#ifdef __linux__
+#ifdef CONFIG_POSIX
 void memory_region_init_ram_from_file(MemoryRegion *mr,
                                       struct Object *owner,
                                       const char *name,