diff --git a/src/common/fswatchercmn.cpp b/src/common/fswatchercmn.cpp
index cb32a14100..b946f6402c 100644
--- a/src/common/fswatchercmn.cpp
+++ b/src/common/fswatchercmn.cpp
@@ -144,9 +144,11 @@ wxFileSystemWatcherBase::AddAny(const wxFileName& path,
     else
     {
         wxFSWatchInfo& watch = it->second;
-        int count = watch.IncRef();
+        const int count = watch.IncRef();
         wxLogTrace(wxTRACE_FSWATCHER,
                    "'%s' is now watched %d times", canonical, count);
+
+        wxUnusedVar(count); // could be unused if debug tracing is disabled
     }
     return true;
 }
diff --git a/src/common/translation.cpp b/src/common/translation.cpp
index 455fb315d0..b5b33de9f1 100644
--- a/src/common/translation.cpp
+++ b/src/common/translation.cpp
@@ -95,6 +95,8 @@ wxStringToStringHashMap gs_msgIdCharset;
 // Platform specific helpers
 // ----------------------------------------------------------------------------
 
+#if wxUSE_LOG_TRACE
+
 void LogTraceArray(const char *prefix, const wxArrayString& arr)
 {
     wxLogTrace(TRACE_I18N, "%s: [%s]", prefix, wxJoin(arr, ','));
@@ -107,6 +109,13 @@ void LogTraceLargeArray(const wxString& prefix, const wxArrayString& arr)
         wxLogTrace(TRACE_I18N, "    %s", *i);
 }
 
+#else // !wxUSE_LOG_TRACE
+
+#define LogTraceArray(prefix, arr)
+#define LogTraceLargeArray(prefix, arr)
+
+#endif // wxUSE_LOG_TRACE/!wxUSE_LOG_TRACE
+
 // Use locale-based detection as a fallback
 wxString GetPreferredUILanguageFallback(const wxArrayString& WXUNUSED(available))
 {
@@ -180,6 +189,8 @@ wxString GetPreferredUILanguage(const wxArrayString& available)
 
 #elif defined(__WXOSX__)
 
+#if wxUSE_LOG_TRACE
+
 void LogTraceArray(const char *prefix, CFArrayRef arr)
 {
     wxString s;
@@ -193,6 +204,8 @@ void LogTraceArray(const char *prefix, CFArrayRef arr)
     wxLogTrace(TRACE_I18N, "%s: [%s]", prefix, s);
 }
 
+#endif // wxUSE_LOG_TRACE
+
 wxString GetPreferredUILanguage(const wxArrayString& available)
 {
     wxStringToStringHashMap availableNormalized;
diff --git a/src/unix/stackwalk.cpp b/src/unix/stackwalk.cpp
index e8cf6edff3..eccb910e11 100644
--- a/src/unix/stackwalk.cpp
+++ b/src/unix/stackwalk.cpp
@@ -215,6 +215,8 @@ bool ReadLine(FILE* fp, unsigned long num, wxString* line)
 {
     if ( !fgets(g_buf, WXSIZEOF(g_buf), fp) )
     {
+        wxUnusedVar(num); // could be unused if debug tracing is disabled
+
         wxLogDebug(wxS("cannot read address information for stack frame #%lu"),
                    num);
         return false;