diff --git a/contrib/src/stc/stc.cpp b/contrib/src/stc/stc.cpp
index 9e417842af..f56024c0ca 100644
--- a/contrib/src/stc/stc.cpp
+++ b/contrib/src/stc/stc.cpp
@@ -1854,7 +1854,7 @@ void wxStyledTextCtrl::OnChar(wxKeyEvent& evt) {
     // alt let's skip it.
     bool ctrl = evt.ControlDown();
     bool alt  = evt.AltDown();
-    bool skip = (ctrl || alt && ! (ctrl && alt));
+    bool skip = ((ctrl || alt) && ! (ctrl && alt));
 
     if (key <= 0xff && !iscntrl(key) && !m_lastKeyDownConsumed && !skip) {
         m_swx->DoAddChar(key);
diff --git a/contrib/src/stc/stc.cpp.in b/contrib/src/stc/stc.cpp.in
index b05ddaf347..991ae203ac 100644
--- a/contrib/src/stc/stc.cpp.in
+++ b/contrib/src/stc/stc.cpp.in
@@ -398,7 +398,7 @@ void wxStyledTextCtrl::OnChar(wxKeyEvent& evt) {
     // alt let's skip it.
     bool ctrl = evt.ControlDown();
     bool alt  = evt.AltDown();
-    bool skip = (ctrl || alt && ! (ctrl && alt));
+    bool skip = ((ctrl || alt) && ! (ctrl && alt));
 
     if (key <= 0xff && !iscntrl(key) && !m_lastKeyDownConsumed && !skip) {
         m_swx->DoAddChar(key);
diff --git a/src/stc/stc.cpp b/src/stc/stc.cpp
index 9e417842af..f56024c0ca 100644
--- a/src/stc/stc.cpp
+++ b/src/stc/stc.cpp
@@ -1854,7 +1854,7 @@ void wxStyledTextCtrl::OnChar(wxKeyEvent& evt) {
     // alt let's skip it.
     bool ctrl = evt.ControlDown();
     bool alt  = evt.AltDown();
-    bool skip = (ctrl || alt && ! (ctrl && alt));
+    bool skip = ((ctrl || alt) && ! (ctrl && alt));
 
     if (key <= 0xff && !iscntrl(key) && !m_lastKeyDownConsumed && !skip) {
         m_swx->DoAddChar(key);
diff --git a/src/stc/stc.cpp.in b/src/stc/stc.cpp.in
index b05ddaf347..991ae203ac 100644
--- a/src/stc/stc.cpp.in
+++ b/src/stc/stc.cpp.in
@@ -398,7 +398,7 @@ void wxStyledTextCtrl::OnChar(wxKeyEvent& evt) {
     // alt let's skip it.
     bool ctrl = evt.ControlDown();
     bool alt  = evt.AltDown();
-    bool skip = (ctrl || alt && ! (ctrl && alt));
+    bool skip = ((ctrl || alt) && ! (ctrl && alt));
 
     if (key <= 0xff && !iscntrl(key) && !m_lastKeyDownConsumed && !skip) {
         m_swx->DoAddChar(key);