diff --git a/NmapOps.h b/NmapOps.h
index 5728a506a..a310ae01c 100644
--- a/NmapOps.h
+++ b/NmapOps.h
@@ -132,7 +132,7 @@
 #include <string>
 #include <map>
 
-class FingerPrintDB;
+struct FingerPrintDB;
 struct FingerMatch;
 
 class NmapOps {
diff --git a/osscan2.h b/osscan2.h
index 2f7ecd441..a0efda29b 100644
--- a/osscan2.h
+++ b/osscan2.h
@@ -134,8 +134,8 @@
 #include <list>
 #include "timing.h"
 #include "tcpip.h"
-class FingerPrint;
-class FingerTest;
+struct FingerPrint;
+struct FingerTest;
 class FingerPrintResultsIPv4;
 class Target;