diff --git a/mex/build/octave/ms_sbvar/Makefile.am b/mex/build/octave/ms_sbvar/Makefile.am
index 4838d211d..f81f84191 100644
--- a/mex/build/octave/ms_sbvar/Makefile.am
+++ b/mex/build/octave/ms_sbvar/Makefile.am
@@ -2,8 +2,8 @@ EXEEXT = .mex
 include ../mex.am
 include ../../ms_sbvar.am
 
-ms_sbvar_command_line_CPPLAGS = $(CPPFLAGS_MATIO)
-ms_sbvar_create_init_file_CPPLAGS = $(CPPFLAGS_MATIO)
+ms_sbvar_command_line_CPPFLAGS = $(CPPFLAGS_MATIO)
+ms_sbvar_create_init_file_CPPFLAGS = $(CPPFLAGS_MATIO)
 
 ms_sbvar_command_line_LDFLAGS = $(LDFLAGS_MATIO)
 ms_sbvar_create_init_file_LDFLAGS = $(LDFLAGS_MATIO)