diff --git a/repos/libports/src/lib/libc/file_operations.cc b/repos/libports/src/lib/libc/file_operations.cc
index f34a1df652..e5f3149b47 100644
--- a/repos/libports/src/lib/libc/file_operations.cc
+++ b/repos/libports/src/lib/libc/file_operations.cc
@@ -63,11 +63,20 @@ Libc::Mmap_registry *Libc::mmap_registry()
 }
 
 
-static Cwd *_cwd_ptr;
+static Cwd          *_cwd_ptr;
+static unsigned int  _mmap_align_log2 { PAGE_SHIFT };
 
-void Libc::init_file_operations(Cwd &cwd)
+void Libc::init_file_operations(Cwd &cwd,
+                                Config_accessor const &config_accessor)
 {
 	_cwd_ptr = &cwd;
+
+	config_accessor.config().with_sub_node("libc", [&] (Xml_node libc) {
+		libc.with_sub_node("mmap", [&] (Xml_node mmap) {
+			_mmap_align_log2 = mmap.attribute_value("align_log2",
+			                                        (unsigned int)PAGE_SHIFT);
+		});
+	});
 }
 
 
@@ -423,7 +432,7 @@ __SYS_(void *, mmap, (void *addr, ::size_t length,
 		}
 
 		bool const executable = prot & PROT_EXEC;
-		void *start = mem_alloc(executable)->alloc(length, PAGE_SHIFT);
+		void *start = mem_alloc(executable)->alloc(length, _mmap_align_log2);
 		if (!start) {
 			errno = ENOMEM;
 			return MAP_FAILED;
diff --git a/repos/libports/src/lib/libc/internal/init.h b/repos/libports/src/lib/libc/internal/init.h
index ecec26be92..1fdb82a1d5 100644
--- a/repos/libports/src/lib/libc/internal/init.h
+++ b/repos/libports/src/lib/libc/internal/init.h
@@ -41,6 +41,7 @@ namespace Libc {
 	struct Timer_accessor;
 	struct Cwd;
 	struct Atexit;
+	struct Config_accessor;
 
 	/**
 	 * Support for shared libraries
@@ -66,7 +67,7 @@ namespace Libc {
 	 * Virtual file system
 	 */
 	void init_vfs_plugin(Monitor &, Genode::Region_map &);
-	void init_file_operations(Cwd &);
+	void init_file_operations(Cwd &, Config_accessor const &);
 
 	/**
 	 * Select support
diff --git a/repos/libports/src/lib/libc/kernel.cc b/repos/libports/src/lib/libc/kernel.cc
index f5d0a5c176..78493a23cb 100644
--- a/repos/libports/src/lib/libc/kernel.cc
+++ b/repos/libports/src/lib/libc/kernel.cc
@@ -474,7 +474,7 @@ Libc::Kernel::Kernel(Genode::Env &env, Genode::Allocator &heap)
 	init_plugin(*this);
 	init_sleep(*this);
 	init_vfs_plugin(*this, _env.rm());
-	init_file_operations(*this);
+	init_file_operations(*this, _libc_env);
 	init_time(*this, *this);
 	init_select(*this, _signal, *this);
 	init_socket_fs(*this);