diff --git a/Makefile.config.in b/Makefile.config.in
index eef1f215..e7f17b29 100644
--- a/Makefile.config.in
+++ b/Makefile.config.in
@@ -170,7 +170,7 @@ LIBS = @LIBS@
 
 INCLUDES = -I$(top_builddir) -I$(top_srcdir)/src
 
-COMPILE = $(CC) $(DEFS) $(INCLUDES) $(AM_CFLAGS) $(CFLAGS)
+COMPILE = $(CC) $(DEFS) $(INCLUDES) $(CPPFLAGS) $(CFLAGS)
 
 MAKE_COLOR = @MAKE_COLOR@
 
diff --git a/Makefile.lib b/Makefile.lib
index 624ff27b..09fa3c9e 100644
--- a/Makefile.lib
+++ b/Makefile.lib
@@ -53,7 +53,7 @@ quiet_cmd_ld_objs = "      [$(LD_COLOR)LD$(END_COLOR)]   $(RELPATH)$@"
          cmd_link = $(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(LIBS)
 
  quiet_cmd_sparse = '    [SPARSE]   $(RELPATH)$(2)'
-       cmd_sparse = $(SPARSE) $(DEFS) $(INCLUDES) $(AM_CFLAGS) $(CFLAGS) $(SPARSE_FLAGS) $(2)
+       cmd_sparse = $(SPARSE) $(DEFS) $(INCLUDES) $(CPPFLAGS) $(CFLAGS) $(SPARSE_FLAGS) $(2)
 
 # Recursive make
 quiet_cmd_recmake = "[$(INFO_COLOR)MAKE $(3)$(END_COLOR)]   $(RELPATH)$(2)"