diff --git a/src/servers/app/FontManager.cpp b/src/servers/app/FontManager.cpp
index a7335d94e4..096c8dc2d4 100644
--- a/src/servers/app/FontManager.cpp
+++ b/src/servers/app/FontManager.cpp
@@ -511,7 +511,7 @@ FontManager::_PrecacheFontFile(const ServerFont* font)
 	while (true) {
 		// We just want the file in the kernel file cache...
 		ssize_t read = file.Read(buffer, bufferSize);
-		if (read < bufferSize)
+		if (read < (ssize_t) bufferSize)
 			break;
 	}