diff --git a/configure.c b/configure.c
index 6d1f1a7..e04b8e0 100644
--- a/configure.c
+++ b/configure.c
@@ -564,6 +564,7 @@ main_build(int argc, char *argv[])
                 fprintf(makefile, " -static");
             }
             fprintf(makefile, " $<");
+            fprintf(makefile, " -I $(CYTO_INC)");
             fprintf(makefile, " -L $(CYTO_LIB)");
             if (with_static)
             {