diff --git a/src/common/memory_util.cpp b/src/common/memory_util.cpp
index 1f19d06c..55ea11c7 100644
--- a/src/common/memory_util.cpp
+++ b/src/common/memory_util.cpp
@@ -11,6 +11,7 @@
     #include "common/string_util.h"
 #else
     #include <cstdlib>
+    #include <cstring>
     #include <sys/mman.h>
 #endif
 
diff --git a/src/common/x64/cpu_detect.cpp b/src/common/x64/cpu_detect.cpp
index ddf557fd..a1fe8b16 100644
--- a/src/common/x64/cpu_detect.cpp
+++ b/src/common/x64/cpu_detect.cpp
@@ -82,7 +82,7 @@ static CPUCaps Detect() {
         caps.vendor = CPUVendor::OTHER;
 
     // Set reasonable default brand string even if brand string not available
-    strcpy_s(caps.cpu_string, sizeof(caps.cpu_string), caps.brand_string);
+    strncpy(caps.cpu_string, caps.brand_string, sizeof(caps.cpu_string));
 
     // Detect family and other miscellaneous features
     if (max_std_fn >= 1) {
diff --git a/tests/arm/fuzz_thumb.cpp b/tests/arm/fuzz_thumb.cpp
index c3c2d88c..d1c200cf 100644
--- a/tests/arm/fuzz_thumb.cpp
+++ b/tests/arm/fuzz_thumb.cpp
@@ -231,12 +231,12 @@ void FuzzJitThumb(const size_t instruction_count, const size_t instructions_to_e
 
             printf("\nInterp Write Records:\n");
             for (auto& record : interp_write_records) {
-                printf("%zu [%x] = %llx\n", record.size, record.address, record.data);
+                printf("%zu [%x] = %" PRIu64 "\n", record.size, record.address, record.data);
             }
 
             printf("\nJIT Write Records:\n");
             for (auto& record : jit_write_records) {
-                printf("%zu [%x] = %llx\n", record.size, record.address, record.data);
+                printf("%zu [%x] = %" PRIu64 "\n", record.size, record.address, record.data);
             }
 
             Dynarmic::IR::Block ir_block = Dynarmic::Arm::Translate({0, true, false, 0}, MemoryRead32);