diff --git a/ext/tk/extconf.rb b/ext/tk/extconf.rb
index ca99129..5b7c19b 100644
--- a/ext/tk/extconf.rb
+++ b/ext/tk/extconf.rb
@@ -623,7 +623,7 @@ def libcheck_for_tclConfig(tcldir, tkdir, tclconf, tkconf)
           $INCFLAGS << " -I" << File.join(File.dirname(File.dirname(file)),"include") if is_win32?
         else
           tcllibs = append_library($libs, libname)
-          tcllibs = "#{libpathflag(tcldir)} #{tcllibs}"
+          tcllibs = "#{libpathflag([tcldir])} #{tcllibs}"
 
           # FIX ME: avoid pathname trouble (fail to find) on MinGW.
           $INCFLAGS << " -I" << File.join(File.dirname(tcldir),"include") if is_win32?
@@ -665,7 +665,7 @@ def libcheck_for_tclConfig(tcldir, tkdir, tclconf, tkconf)
         else
           tklibs = append_library("", libname)
           #tklibs = append_library("", $1)
-          tklibs = "#{libpathflag(tkdir)} #{tklibs}"
+          tklibs = "#{libpathflag([tkdir])} #{tklibs}"
 
           # FIX ME: avoid pathname trouble (fail to find) on MinGW.
           $INCFLAGS << " -I" << File.join(File.dirname(tcldir),"include") if is_win32?
@@ -1161,7 +1161,7 @@ def find_tcl(tcllib, stubs, version, *opt_paths)
                   tcllibs = libs_param + " -DSTATIC_BUILD " + fname.quote
                 else
                   tcllibs = append_library($libs, lib_w_sufx)
-                  tcllibs = "#{libpathflag(path)} #{tcllibs}"
+                  tcllibs = "#{libpathflag([path])} #{tcllibs}"
                 end
                 if try_func(func, tcllibs, ["tcl.h"])
                   return [true, path, nil, tcllibs, *inc]
@@ -1300,7 +1300,7 @@ def find_tk(tklib, stubs, version, *opt_paths)
                   tklibs = libs_param + " -DSTATIC_BUILD " + fname.quote
                 else
                   tklibs = append_library($libs, lib_w_sufx)
-                  tklibs = "#{libpathflag(path)} #{tklibs}"
+                  tklibs = "#{libpathflag([path])} #{tklibs}"
                 end
                 if try_func(func, tklibs, ["tcl.h", "tk.h"])
                   return [true, path, nil, tklibs, *inc]