diff --git a/src/default.c b/src/default.c
index a58bf02a..986ae6e5 100644
--- a/src/default.c
+++ b/src/default.c
@@ -506,7 +506,7 @@ static const char *default_variables[] =
     "COMPILE.s", "$(AS) $(ASFLAGS) $(TARGET_MACH)",
     "LINK.S", "$(CC) $(ASFLAGS) $(CPPFLAGS) $(LDFLAGS) $(TARGET_MACH)",
     "COMPILE.S", "$(CC) $(ASFLAGS) $(CPPFLAGS) $(TARGET_MACH) -c",
-    "PREPROCESS.S", "$(CC) -E $(CPPFLAGS)",
+    "PREPROCESS.S", "$(CPP) $(CPPFLAGS)",
     "PREPROCESS.F", "$(FC) $(FFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -F",
     "PREPROCESS.r", "$(FC) $(FFLAGS) $(RFLAGS) $(TARGET_ARCH) -F",
     "LINT.c", "$(LINT) $(LINTFLAGS) $(CPPFLAGS) $(TARGET_ARCH)",
@@ -641,7 +641,7 @@ static const char *default_variables[] =
     "COMPILE.s", "$(AS) $(ASFLAGS) $(TARGET_MACH)",
     "LINK.S", "$(CC) $(ASFLAGS) $(CPPFLAGS) $(LDFLAGS) $(TARGET_MACH)",
     "COMPILE.S", "$(CC) $(ASFLAGS) $(CPPFLAGS) $(TARGET_MACH) -c",
-    "PREPROCESS.S", "$(CC) -E $(CPPFLAGS)",
+    "PREPROCESS.S", "$(CPP) $(CPPFLAGS)",
     "PREPROCESS.F", "$(FC) $(FFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -F",
     "PREPROCESS.r", "$(FC) $(FFLAGS) $(RFLAGS) $(TARGET_ARCH) -F",
     "LINT.c", "$(LINT) $(LINTFLAGS) $(CPPFLAGS) $(TARGET_ARCH)",