diff --git a/Makefile b/Makefile
index 1543e0d..9805f85 100644
--- a/Makefile
+++ b/Makefile
@@ -67,7 +67,7 @@
 ################ Build rules
 
 # Verify the gcc configuration and test if -fwhole-program works.
-TESTGCC:=$(shell CC=$(CC) tools/test-gcc.sh)
+TESTGCC:=$(shell CC="$(CC)" tools/test-gcc.sh)
 ifeq "$(TESTGCC)" "-1"
 $(error "Please upgrade GCC")
 endif
diff --git a/src/coreboot.c b/src/coreboot.c
index db0063b..554ea81 100644
--- a/src/coreboot.c
+++ b/src/coreboot.c
@@ -326,7 +326,7 @@
     u8 scratch[15980];
     int need = (LzmaGetNumProbs(&state.Properties) * sizeof(CProb));
     if (need > sizeof(scratch)) {
-        dprintf(1, "LzmaDecode need %d have %d\n", need, sizeof(scratch));
+        dprintf(1, "LzmaDecode need %d have %d\n", need, (unsigned int)sizeof(scratch));
         return -1;
     }
     state.Probs = (CProb *)scratch;