diff --git a/src/debug.cpp b/src/debug.cpp
index 328d93bad..fe1d90e25 100644
--- a/src/debug.cpp
+++ b/src/debug.cpp
@@ -107,10 +107,7 @@ int log_vprintf(int level, const char *format, va_list ap)
         buf.append(size + 1, '\0');
 
         va_copy(aq, ap);
-        if (vsnprintf(buf.data() + style.length(), size + 1, format, ap) != size) {
-                va_end(aq);
-                return 0;
-        }
+        vsnprintf(buf.data() + style.length(), size + 1, format, ap);
         va_end(aq);
         auto & str = buf.get();
         str.resize(str.size() - 1); // drop '\0' written by vsnprintf
diff --git a/src/utils/color_out.cpp b/src/utils/color_out.cpp
index 18e13fe18..a4b469587 100644
--- a/src/utils/color_out.cpp
+++ b/src/utils/color_out.cpp
@@ -205,7 +205,7 @@ int color_printf(const char *format, ...) {
         auto buf = get_log_output().get_buffer();
         buf.append(size + 1, '\0');
         va_start(ap, format);
-        size = vsnprintf(buf.data(), size + 1, format, ap);
+        vsnprintf(buf.data(), size + 1, format, ap);
         va_end(ap);
 
         if (!color_stdout) {