diff --git a/NEWS.md b/NEWS.md
index b08f0d69..e52fd412 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -30,6 +30,7 @@ Red Panda C++ Version 2.24
   - enhancement: Support sdcc compiler.
   - enhancement: Autowrap tool output text.
   - fix: Press up/down arrow key in the option dialog's left panel won't switch page.
+  - fix: Can't suggest header filename starting with numbers.
 
 Red Panda C++ Version 2.23
 
diff --git a/RedPandaIDE/editor.cpp b/RedPandaIDE/editor.cpp
index 26907c3a..563c8226 100644
--- a/RedPandaIDE/editor.cpp
+++ b/RedPandaIDE/editor.cpp
@@ -961,7 +961,13 @@ void Editor::keyPressEvent(QKeyEvent *event)
     } else {
         if (pSettings->codeCompletion().enabled()
                 && pSettings->codeCompletion().showCompletionWhileInput() ) {
-            if (syntaxer() && syntaxer()->language()==QSynedit::ProgrammingLanguage::CPP) {
+            if (mParser && mParser->isIncludeLine(lineText())) {
+                // is a #include line
+                processCommand(QSynedit::EditCommand::Char,ch,nullptr);
+                showHeaderCompletion(false);
+                handled=true;
+                return;
+            } else if (syntaxer() && syntaxer()->language()==QSynedit::ProgrammingLanguage::CPP) {
                 //preprocessor ?
                 if ((idCharPressed==0) && (ch=='#') && lineText().isEmpty()) {
                     processCommand(QSynedit::EditCommand::Char,ch,nullptr);
diff --git a/RedPandaIDE/settings.cpp b/RedPandaIDE/settings.cpp
index 95dd7969..449ef9e8 100644
--- a/RedPandaIDE/settings.cpp
+++ b/RedPandaIDE/settings.cpp
@@ -2348,6 +2348,19 @@ QStringList Settings::CompilerSet::defines(bool isCpp) {
         arguments.append("c");
         arguments.append("-V");
         key=SDCC_CMD_OPT_PROCESSOR;
+        //language standard
+        PCompilerOption pOption = CompilerInfoManager::getCompilerOption(compilerType(), key);
+        if (pOption) {
+            if (!mCompileOptions[key].isEmpty())
+                arguments.append(pOption->setting + mCompileOptions[key]);
+        }
+        key=SDCC_CMD_OPT_STD;
+        //language standard
+        pOption = CompilerInfoManager::getCompilerOption(compilerType(), key);
+        if (pOption) {
+            if (!mCompileOptions[key].isEmpty())
+                arguments.append(pOption->setting + mCompileOptions[key]);
+        }
     } else {
 #endif
         if (isCpp) {
@@ -2357,15 +2370,16 @@ QStringList Settings::CompilerSet::defines(bool isCpp) {
             arguments.append("c");
             key=C_CMD_OPT_STD;
         }
+        //language standard
+        PCompilerOption pOption = CompilerInfoManager::getCompilerOption(compilerType(), key);
+        if (pOption) {
+            if (!mCompileOptions[key].isEmpty())
+                arguments.append(pOption->setting + mCompileOptions[key]);
+        }
 #ifdef ENABLE_SDCC
     }
 #endif
-    //language standard
-    PCompilerOption pOption = CompilerInfoManager::getCompilerOption(compilerType(), key);
-    if (pOption) {
-        if (!mCompileOptions[key].isEmpty())
-            arguments.append(pOption->setting + mCompileOptions[key]);
-    }
+
 
     arguments.append(NULL_FILE);
 
@@ -2610,6 +2624,12 @@ void Settings::CompilerSet::setSDCCDirectories(const QString& binDir)
     QStringList arguments;
     arguments.clear();
     arguments.append("--print-search-dirs");
+    QString key = SDCC_CMD_OPT_PROCESSOR;
+    PCompilerOption pOption = CompilerInfoManager::getCompilerOption(compilerType(), key);
+    if (pOption) {
+        if (!mCompileOptions[key].isEmpty())
+            arguments.append(pOption->setting + mCompileOptions[key]);
+    }
     QByteArray output = getCompilerOutput(binDir,c_prog,arguments);
 
     //bindirs