diff --git a/crypto1_bs.c b/crypto1_bs.c
index 2fc7963..2bb1194 100644
--- a/crypto1_bs.c
+++ b/crypto1_bs.c
@@ -23,6 +23,11 @@ THE SOFTWARE.
 */
 
 #include "crypto1_bs.h"
+#include <inttypes.h>
+#define __STDC_FORMAT_MACROS
+#define llx PRIx64
+#define lli PRIi64
+#define lu PRIu32
 
 // The following functions use this global or thread-local state
 // It is sized to fit exactly KEYSTREAM_SIZE more states next to the initial state
@@ -109,7 +114,7 @@ void crypto1_bs_print_states(bitslice_t bitsliced_states[]){
     state_t values[MAX_BITSLICES];
     crypto1_bs_convert_states(bitsliced_states, values);
     for(slice_idx = 0; slice_idx < MAX_BITSLICES; slice_idx++){
-        printf("State %03lu: %012lx\n", slice_idx, values[slice_idx].value);
+        printf("State %03zu: %012"llx"\n", slice_idx, values[slice_idx].value);
     }
 }
 
diff --git a/solve_bs.c b/solve_bs.c
index bffaabc..864269c 100644
--- a/solve_bs.c
+++ b/solve_bs.c
@@ -8,6 +8,11 @@
 #include "craptev1.h"
 #include "crypto1_bs.h"
 #include "crypto1_bs_crack.h"
+#include <inttypes.h>
+#define __STDC_FORMAT_MACROS
+#define llx PRIx64
+#define lli PRIi64
+#define lu PRIu32
 
 // linked from .so / .c files by bla
 extern uint64_t *readnonces(char* fname);
@@ -70,14 +75,14 @@ int main(int argc, char* argv[]){
     total_states_tested = 0;
     keys_found = 0;
 
-    printf("Starting %lu threads to test %lu states\n", thread_count, total_states);
+    printf("Starting %zu threads to test %zu states\n", thread_count, total_states);
     for(i = 0; i < thread_count; i++){
         pthread_create(&threads[i], NULL, crack_states_thread, (void*) i);
     }
     for(i = 0; i < thread_count; i++){
         pthread_join(threads[i], 0);
     }
-    printf("Tested %lu states\n", total_states_tested);
+    printf("Tested %zu states\n", total_states_tested);
 
     craptev1_destroy_space(space);
     return 0;
diff --git a/solve_piwi.c b/solve_piwi.c
index ea21c3b..9902468 100644
--- a/solve_piwi.c
+++ b/solve_piwi.c
@@ -5,6 +5,11 @@
 #include <pthread.h>
 #include <sys/sysinfo.h>
 #include "craptev1.h"
+#include <inttypes.h>
+#define __STDC_FORMAT_MACROS
+#define llx PRIx64
+#define lli PRIi64
+#define lu PRIu32
 
 #define rev32(word) (((word & 0xff) << 24) | (((word >> 8) & 0xff) << 16) | (((word >> 16) & 0xff) << 8) | (((word >> 24) & 0xff)))
 
@@ -50,7 +55,7 @@ void* crack_states_thread(void* x){
         states_tested = total_states - craptev1_sizeof_space(space+j*5);
         printf("Cracking... %6.02f%%\n", (100.0*states_tested/(total_states)));
         if(key != -1){
-            printf("Found key: %012lx\n", key);
+            printf("Found key: %012"llx"\n", key);
             exit(0);
         }
     }
@@ -68,7 +73,7 @@ int main(int argc, char* argv[]){
 
     thread_count = get_nprocs_conf();
     pthread_t threads[thread_count];
-    printf("Starting %lu threads to test %lu states\n", thread_count, total_states);
+    printf("Starting %zu threads to test %zu states\n", thread_count, total_states);
     size_t i;
     states_tested = 0;
     for(i = 0; i < thread_count; i++){
@@ -77,7 +82,7 @@ int main(int argc, char* argv[]){
     for(i = 0; i < thread_count; i++){
         pthread_join(threads[i], 0);
     }
-    printf("Tested %lu states\n", states_tested);
+    printf("Tested %zu states\n", states_tested);
 
     craptev1_destroy_space(space);
     return 0;
diff --git a/solve_piwi_bs.c b/solve_piwi_bs.c
index aea81b3..69acd83 100644
--- a/solve_piwi_bs.c
+++ b/solve_piwi_bs.c
@@ -8,6 +8,11 @@
 #include "craptev1.h"
 #include "crypto1_bs.h"
 #include "crypto1_bs_crack.h"
+#include <inttypes.h>
+#define __STDC_FORMAT_MACROS
+#define llx PRIx64
+#define lli PRIi64
+#define lu PRIu32
 
 uint64_t split(uint8_t p){
     return (((p & 0x8) >>3 )| ((p & 0x4) >> 2) << 8 | ((p & 0x2) >> 1) << 16 | (p & 0x1) << 24 );
@@ -46,7 +51,7 @@ void* crack_states_thread(void* x){
     for(j = thread_id; space[j * 5]; j += thread_count) {
         const uint64_t key = crack_states_bitsliced(space + j * 5);
         if(key != -1){
-            printf("Found key: %012lx\n", key);
+            printf("Found key: %012"llx"\n", key);
             __sync_fetch_and_add(&keys_found, 1);
             break;
         } else if(keys_found){
@@ -94,14 +99,14 @@ int main(int argc, char* argv[]){
     total_states_tested = 0;
     keys_found = 0;
 
-    printf("Starting %lu threads to test %lu states\n", thread_count, total_states);
+    printf("Starting %zu threads to test %zu states\n", thread_count, total_states);
     for(i = 0; i < thread_count; i++){
         pthread_create(&threads[i], NULL, crack_states_thread, (void*) i);
     }
     for(i = 0; i < thread_count; i++){
         pthread_join(threads[i], 0);
     }
-    printf("Tested %lu states\n", total_states_tested);
+    printf("Tested %zu states\n", total_states_tested);
 
     craptev1_destroy_space(space);
     return 0;