diff --git a/Contrib/InstallOptions/SConscript b/Contrib/InstallOptions/SConscript
index 3eac2c87..a3d4aaaf 100644
--- a/Contrib/InstallOptions/SConscript
+++ b/Contrib/InstallOptions/SConscript
@@ -37,10 +37,10 @@ includes = Split("""
 	InstallOptions.nsh
 """)
 
-Import('BuildPlugin env')
+Import('BuildPlugin env PerformPluginExtrasDistOperationOnce')
 
 unicodetarget = 'UNICODE' in env['CPPDEFINES']
 
 BuildPlugin(target, files, libs, examples, docs, res = resources)
-if not unicodetarget:
+if PerformPluginExtrasDistOperationOnce(env, unicodetarget):
 	env.DistributeInclude(includes)
diff --git a/Contrib/nsDialogs/SConscript b/Contrib/nsDialogs/SConscript
index d5f1755e..86552282 100644
--- a/Contrib/nsDialogs/SConscript
+++ b/Contrib/nsDialogs/SConscript
@@ -36,10 +36,10 @@ includes = Split("""
 	nsDialogs.nsh
 """)
 
-Import('BuildPlugin env')
+Import('BuildPlugin env PerformPluginExtrasDistOperationOnce')
 
 unicodetarget = 'UNICODE' in env['CPPDEFINES']
 
 BuildPlugin(target, files, libs, examples, docs, res = resources)
-if not unicodetarget:
+if PerformPluginExtrasDistOperationOnce(env, unicodetarget):
 	env.DistributeInclude(includes)