diff --git a/src/ciderlib/oned/onecont.c b/src/ciderlib/oned/onecont.c
index 61b4c3fa0..19a552cc8 100644
--- a/src/ciderlib/oned/onecont.c
+++ b/src/ciderlib/oned/onecont.c
@@ -8,7 +8,7 @@ Author:	1987 Kartikeya Mayaram, U. C. Berkeley CAD Group
 #include "numenum.h"
 #include "onemesh.h"
 #include "onedev.h"
-#include "spMatrix.h"
+#include "spmatrix.h"
 #include "macros.h"
 #include "onedext.h"
 #include "oneddefs.h"