diff --git a/src/nlsr_sm.cpp b/src/nlsr_sm.cpp
index 4a1706d..1744897 100644
--- a/src/nlsr_sm.cpp
+++ b/src/nlsr_sm.cpp
@@ -4,6 +4,6 @@
 
 using namespace std;
 
-class nlsr;
+class Nlsr;