diff --git a/src/libcore/bitmap.cpp b/src/libcore/bitmap.cpp
index b89d6185..42eb3c9b 100644
--- a/src/libcore/bitmap.cpp
+++ b/src/libcore/bitmap.cpp
@@ -2883,7 +2883,7 @@ void Bitmap::writeOpenEXR(Stream *stream) const {
 	file.writePixels(m_size.y);
 }
 #else
-void Bitmap::readOpenEXR(Stream *stream) {
+void Bitmap::readOpenEXR(Stream *stream, const std::string &_prefix) {
 	Log(EError, "Bitmap::readOpenEXR(): OpenEXR support was disabled at compile time!");
 }
 void Bitmap::writeOpenEXR(Stream *stream) const {