diff --git a/client/Makefile b/client/Makefile
index 48a1a3591..9904e8b27 100644
--- a/client/Makefile
+++ b/client/Makefile
@@ -58,9 +58,9 @@ INCLUDES_CLIENT += -I./src -I../include -I../common -I../common_fpga $(LIBS)
 #CFLAGS ?= -Wall -Werror -O3
 ifeq ($(platform),Darwin)
 # readline has strict-prototype issues
-CFLAGS ?= -Wall -Werror -O3 -Wredundant-decls -Wmissing-prototypes -Wchar-subscripts -Wundef -Wcast-align -Wwrite-strings -Wunused -Wuninitialized -Wpointer-arith -Winline -Wformat -Wformat-security -Winit-self -Wmissing-include-dirs -Wnested-externs -Wmissing-declarations
+CFLAGS ?= -Wall -Werror -O3 -Wredundant-decls -Wmissing-prototypes -Wchar-subscripts -Wundef -Wcast-align -Wno-error=cast-align -Wwrite-strings -Wunused -Wuninitialized -Wpointer-arith -Winline -Wformat -Wformat-security -Winit-self -Wmissing-include-dirs -Wnested-externs -Wmissing-declarations
 else
-CFLAGS ?= -Wall -Werror -O3 -Wredundant-decls -Wmissing-prototypes -Wchar-subscripts -Wundef -Wcast-align -Wwrite-strings -Wunused -Wuninitialized -Wpointer-arith -Winline -Wformat -Wformat-security -Winit-self -Wmissing-include-dirs -Wstrict-prototypes -Wnested-externs -Wmissing-declarations
+CFLAGS ?= -Wall -Werror -O3 -Wredundant-decls -Wmissing-prototypes -Wchar-subscripts -Wundef -Wcast-align -Wno-error=cast-align -Wwrite-strings -Wunused -Wuninitialized -Wpointer-arith -Winline -Wformat -Wformat-security -Winit-self -Wmissing-include-dirs -Wstrict-prototypes -Wnested-externs -Wmissing-declarations
 endif
 #  -Wshadow
 #  -Wbad-function-cast -Wextra -Wswitch-enum -Wold-style-definition
diff --git a/client/deps/cliparser/Makefile b/client/deps/cliparser/Makefile
index 7f4409de0..4873372c4 100644
--- a/client/deps/cliparser/Makefile
+++ b/client/deps/cliparser/Makefile
@@ -1,6 +1,6 @@
 MYSRCPATHS =
 MYINCLUDES = -I../../../common -I../../../include -I../../src
-MYCFLAGS =
+MYCFLAGS = -Wno-cast-align
 MYDEFS =
 MYSRCS = \
 	argtable3.c \
diff --git a/client/deps/jansson/Makefile b/client/deps/jansson/Makefile
index 152e8bcb9..c0d16d6a3 100644
--- a/client/deps/jansson/Makefile
+++ b/client/deps/jansson/Makefile
@@ -1,6 +1,6 @@
 MYSRCPATHS =
 MYINCLUDES = -I.
-MYCFLAGS = -Wno-unused-function
+MYCFLAGS = -Wno-unused-function -Wno-cast-align
 MYDEFS = -DHAVE_STDINT_H
 MYSRCS = \
 	dump.c \
diff --git a/client/deps/liblua/Makefile b/client/deps/liblua/Makefile
index 54e45185b..0b05279b7 100644
--- a/client/deps/liblua/Makefile
+++ b/client/deps/liblua/Makefile
@@ -1,7 +1,7 @@
 MYSRCPATHS =
 MYINCLUDES = -I.
 # Lua lib requires GNU extensions (implicit declarations of functions): -std=gnu99 or -std=gnu11
-MYCFLAGS =
+MYCFLAGS = -Wno-cast-align
 MYDEFS = -DLUA_COMPAT_ALL $(SYSCFLAGS)
 MYSRCS =	lapi.c lcode.c lctype.c ldebug.c ldo.c ldump.c lfunc.c lgc.c llex.c \
 	lmem.c lobject.c lopcodes.c lparser.c lstate.c lstring.c ltable.c \
diff --git a/client/src/mifare/mfkey.c b/client/src/mifare/mfkey.c
index 7d04762b8..710bba449 100644
--- a/client/src/mifare/mfkey.c
+++ b/client/src/mifare/mfkey.c
@@ -45,11 +45,14 @@ uint32_t intersection(uint64_t *listA, uint64_t *listB) {
 // Darkside attack (hf mf mifare)
 // if successful it will return a list of keys, not just one.
 uint32_t nonce2key(uint32_t uid, uint32_t nt, uint32_t nr, uint32_t ar, uint64_t par_info, uint64_t ks_info, uint64_t **keys) {
-    struct Crypto1State *states;
+    union {
+        struct Crypto1State *states;
+        uint64_t *keylist;
+    } unionstate;
+
     uint32_t i, pos;
     uint8_t ks3x[8], par[8][8];
     uint64_t key_recovered;
-    uint64_t *keylist;
 
     // Reset the last three significant bits of the reader nonce
     nr &= 0xFFFFFF1F;
@@ -68,23 +71,21 @@ uint32_t nonce2key(uint32_t uid, uint32_t nt, uint32_t nr, uint32_t ar, uint64_t
         par[7 - pos][7] = (bt >> 7) & 1;
     }
 
-    states = lfsr_common_prefix(nr, ar, ks3x, par, (par_info == 0));
+    unionstate.states = lfsr_common_prefix(nr, ar, ks3x, par, (par_info == 0));
 
-    if (!states) {
+    if (!unionstate.states) {
         *keys = NULL;
         return 0;
     }
 
-    keylist = (uint64_t *)states;
-
-    for (i = 0; keylist[i]; i++) {
-        lfsr_rollback_word(states + i, uid ^ nt, 0);
-        crypto1_get_lfsr(states + i, &key_recovered);
-        keylist[i] = key_recovered;
+    for (i = 0; unionstate.keylist[i]; i++) {
+        lfsr_rollback_word(unionstate.states + i, uid ^ nt, 0);
+        crypto1_get_lfsr(unionstate.states + i, &key_recovered);
+        unionstate.keylist[i] = key_recovered;
     }
-    keylist[i] = -1;
+    unionstate.keylist[i] = -1;
 
-    *keys = keylist;
+    *keys = unionstate.keylist;
     return i;
 }
 
diff --git a/client/src/mifare/mifarehost.c b/client/src/mifare/mifarehost.c
index 8b57604f9..c3ad1b0a0 100644
--- a/client/src/mifare/mifarehost.c
+++ b/client/src/mifare/mifarehost.c
@@ -378,7 +378,7 @@ __attribute__((force_align_arg_pointer))
     StateList_t *statelist = arg;
     statelist->head.slhead = lfsr_recovery32(statelist->ks1, statelist->nt_enc ^ statelist->uid);
 
-    for (p1 = statelist->head.slhead; * (uint64_t *)p1 != 0; p1++) {};
+    for (p1 = statelist->head.slhead; p1->odd | p1->even; p1++) {};
 
     statelist->len = p1 - statelist->head.slhead;
     statelist->tail.sltail = --p1;
@@ -492,8 +492,10 @@ int mfnested(uint8_t blockNo, uint8_t keyType, uint8_t *key, uint8_t trgBlockNo,
         }
     }
 
-    *(uint64_t *)p3 = -1;
-    *(uint64_t *)p4 = -1;
+    p3->odd = -1;
+    p3->even = -1;
+    p4->odd = -1;
+    p4->even = -1;
     statelists[0].len = p3 - statelists[0].head.slhead;
     statelists[1].len = p4 - statelists[1].head.slhead;
     statelists[0].tail.sltail = --p3;
@@ -637,7 +639,8 @@ int mfStaticNested(uint8_t blockNo, uint8_t keyType, uint8_t *key, uint8_t trgBl
         }
     }
 
-    *(uint64_t *)p3 = -1;
+    p3->odd = -1;
+    p3->even = -1;
     statelists[0].len = p3 - statelists[0].head.slhead;
     statelists[0].tail.sltail = --p3;
 
diff --git a/common/crc32.c b/common/crc32.c
index 440bed910..b539baa05 100644
--- a/common/crc32.c
+++ b/common/crc32.c
@@ -23,8 +23,10 @@ void crc32_ex(const uint8_t *data, const size_t len, uint8_t *crc) {
     for (size_t i = 0; i < len; i++) {
         crc32_byte(&desfire_crc, data[i]);
     }
-
-    *((uint32_t *)(crc)) = htole32(desfire_crc);
+    uint32_t crctmp = htole32(desfire_crc);
+    for (size_t i=0; i < sizeof(uint32_t); i++) {
+        crc[i] = ((uint8_t *) &crctmp)[i];
+    }
 }
 
 void crc32_append(uint8_t *data, const size_t len) {
diff --git a/common/mbedtls/Makefile b/common/mbedtls/Makefile
index be5f08a0a..880f6bcc8 100644
--- a/common/mbedtls/Makefile
+++ b/common/mbedtls/Makefile
@@ -1,6 +1,6 @@
 MYSRCPATHS =
 MYINCLUDES = -I. -I..
-MYCFLAGS =
+MYCFLAGS = -Wno-cast-align
 MYDEFS =
 MYSRCS = \
 	aes.c \