diff --git a/hy/compiler.py b/hy/compiler.py
index 4b109fb..be5a7a6 100755
--- a/hy/compiler.py
+++ b/hy/compiler.py
@@ -1122,11 +1122,10 @@ class HyASTCompiler(object):
                     names = [ast.alias(name="*", asname=None)]
                 elif assignments == "ALL":
                     node = asty.Import
+                    prefix = ast_str(prefix, piecewise=True)
                     names = [ast.alias(
                         name=ast_module,
-                        asname=ast_str(prefix)
-                            if prefix and prefix != module
-                            else None)]
+                        asname=prefix if prefix != module else None)]
                 else:
                     node = asty.ImportFrom
                     names = [
diff --git a/tests/compilers/test_ast.py b/tests/compilers/test_ast.py
index d7e7875..04b4d15 100644
--- a/tests/compilers/test_ast.py
+++ b/tests/compilers/test_ast.py
@@ -256,6 +256,14 @@ def test_ast_bad_yield():
     cant_compile("(yield 1 2)")
 
 
+def test_ast_import_mangle_dotted():
+    """Mangling a module name with a period shouldn't create a spurious
+    `asname`."""
+    code = can_compile("(import a-b.c)")
+    assert code.body[0].names[0].name == "a_b.c"
+    assert code.body[0].names[0].asname is None
+
+
 def test_ast_good_import_from():
     "Make sure AST can compile valid selective import"
     can_compile("(import [x [y]])")