diff --git a/src/project.cpp b/src/project.cpp
index 0942c101..62f12185 100644
--- a/src/project.cpp
+++ b/src/project.cpp
@@ -2218,10 +2218,15 @@ bool Project::readSecretBaseIds() {
     if (!projectConfig.getEventSecretBaseEnabled())
         return true;
 
+    // SECRET_BASE_GROUP is a function-like macro, which Porymap can't handle.
+    // Redefine it so Porymap won't produce spurious errors about failing to parse it.
+    QMap<QString, int> knownDefines = QMap<QString, int>();
+    knownDefines.insert("SECRET_BASE_GROUP", 0);
+
     QStringList prefixes("\\bSECRET_BASE_[A-Za-z0-9_]*_[0-9]+");
     QString filename = "include/constants/secret_bases.h";
     fileWatcher.addPath(root + "/" + filename);
-    secretBaseIds = parser.readCDefinesSorted(filename, prefixes);
+    secretBaseIds = parser.readCDefinesSorted(filename, prefixes, knownDefines);
     if (secretBaseIds.isEmpty()) {
         logError(QString("Failed to read secret base id constants from %1").arg(filename));
         return false;