diff --git a/src/generator/generator.cpp b/src/generator/generator.cpp
--- a/src/generator/generator.cpp
+++ b/src/generator/generator.cpp
@@ -740,7 +740,7 @@
     nameStrTab.writeCode("line_name_stringtab", out);
     logoStrTab.writeCode("line_logo_stringtab", out);
     // create a symbolic name for the common no logo case (reduces diff on changes)
-    out->write("static const constexpr auto NoLogo = ");
+    out->write("static const constexpr uint16_t NoLogo = ");
     out->write(QByteArray::number((int)logoStrTab.stringOffset(QString())));
     out->write(";\n\n");
 
diff --git a/src/lib/knowledgedb/linemetadata_data.cpp b/src/lib/knowledgedb/linemetadata_data.cpp
--- a/src/lib/knowledgedb/linemetadata_data.cpp
+++ b/src/lib/knowledgedb/linemetadata_data.cpp
@@ -1202,7 +1202,7 @@
     "Milano linea M1.svg\0"
 };
 
-static const constexpr auto NoLogo = 25;
+static const constexpr uint16_t NoLogo = 25;
 
 static const constexpr LineMetaDataContent line_data[] = {
     { 1, NoLogo, NoLogo, LineMetaDataContent::Tramway, Color{0xf38bb9} }, // 70 OSM: 9056 WD: Q6811967 -37.84, 144.9 x -37.81, 145.1