diff --git a/common/legic_prng.c b/common/legic_prng.c
index 8646f55a9..1447d3b1b 100644
--- a/common/legic_prng.c
+++ b/common/legic_prng.c
@@ -46,7 +46,7 @@ void legic_prng_forward(int count) {
     }
 }
 
-uint8_t legic_prng_get_bit() {
+uint8_t legic_prng_get_bit(void) {
     uint8_t idx = 7 - ((lfsr.a & 4) | (lfsr.a >> 2 & 2) | (lfsr.a >> 4 & 1));
     return lfsr.b >> idx & 1;
 }
diff --git a/common/zlib/Makefile b/common/zlib/Makefile
index baec1eb1e..2f68e0ea2 100644
--- a/common/zlib/Makefile
+++ b/common/zlib/Makefile
@@ -1,7 +1,7 @@
 MYSRCPATHS = ../../common/zlib
 MYSRCS     = deflate.c adler32.c trees.c zutil.c inflate.c inffast.c inftrees.c
 MYINCLUDES = -I../../common/zlib
-MYCFLAGS   = -Wno-strict-prototypes -Wno-missing-prototypes -Wno-missing-declarations
+MYCFLAGS   = -Wno-strict-prototypes -Wno-missing-prototypes -Wno-missing-declarations -Wno-old-style-definition -Wno-implicit-fallthrough
 MYDEFS     = -DZ_SOLO -DNO_GZIP -DZLIB_PM3_TUNED
 #-DDEBUG -Dverbose=1