diff --git a/src/ARMJIT_Memory.cpp b/src/ARMJIT_Memory.cpp
index 51e022d180..2a1041042f 100644
--- a/src/ARMJIT_Memory.cpp
+++ b/src/ARMJIT_Memory.cpp
@@ -717,7 +717,7 @@ ARMJIT_Memory::ARMJIT_Memory(melonDS::NDS& nds) : NDS(nds)
     }
 #else
     char fastmemPidName[snprintf(NULL, 0, "/melondsfastmem%d", getpid()) + 1];
-    sprintf(fastmemPidName, "/melondsfastmem%d", getpid());
+    snprintf(fastmemPidName, sizeof(fastmemPidName), "/melondsfastmem%d", getpid());
     MemoryFile = shm_open(fastmemPidName, O_RDWR | O_CREAT | O_EXCL, 0600);
     if (MemoryFile == -1)
     {
@@ -1432,4 +1432,4 @@ void* ARMJIT_Memory::GetFuncForAddr(ARM* cpu, u32 addr, bool store, int size) co
     }
     return NULL;
 }
-}
\ No newline at end of file
+}
diff --git a/src/frontend/qt_sdl/EmuThread.cpp b/src/frontend/qt_sdl/EmuThread.cpp
index f767c6db4b..d7b36e9373 100644
--- a/src/frontend/qt_sdl/EmuThread.cpp
+++ b/src/frontend/qt_sdl/EmuThread.cpp
@@ -428,9 +428,9 @@ void EmuThread::run()
                 double actualfps = (59.8261 * 263.0) / nlines;
                 int inst = emuInstance->instanceID;
                 if (inst == 0)
-                    sprintf(melontitle, "[%d/%.0f] melonDS " MELONDS_VERSION, fps, actualfps);
+                    snprintf(melontitle, sizeof(melontitle), "[%d/%.0f] melonDS " MELONDS_VERSION, fps, actualfps);
                 else
-                    sprintf(melontitle, "[%d/%.0f] melonDS (%d)", fps, fpstarget, inst+1);
+                    snprintf(melontitle, sizeof(melontitle), "[%d/%.0f] melonDS (%d)", fps, fpstarget, inst+1);
                 changeWindowTitle(melontitle);
             }
         }
@@ -445,9 +445,9 @@ void EmuThread::run()
 
             int inst = emuInstance->instanceID;
             if (inst == 0)
-                sprintf(melontitle, "melonDS " MELONDS_VERSION);
+                snprintf(melontitle, sizeof(melontitle), "melonDS " MELONDS_VERSION);
             else
-                sprintf(melontitle, "melonDS (%d)", inst+1);
+                snprintf(melontitle, sizeof(melontitle), "melonDS (%d)", inst+1);
             changeWindowTitle(melontitle);
 
             SDL_Delay(75);
diff --git a/src/frontend/qt_sdl/NetplayDialog.cpp b/src/frontend/qt_sdl/NetplayDialog.cpp
index d7b7cf8166..3657eef8ca 100644
--- a/src/frontend/qt_sdl/NetplayDialog.cpp
+++ b/src/frontend/qt_sdl/NetplayDialog.cpp
@@ -187,7 +187,7 @@ void NetplayDialog::doUpdatePlayerList(Netplay::Player* players, int num)
 
         char ip[32];
         u32 addr = player->Address;
-        sprintf(ip, "%d.%d.%d.%d", addr&0xFF, (addr>>8)&0xFF, (addr>>16)&0xFF, addr>>24);
+        snprintf(ip, sizeof(ip), "%d.%d.%d.%d", addr&0xFF, (addr>>8)&0xFF, (addr>>16)&0xFF, addr>>24);
         model->setItem(i, 4, new QStandardItem(ip));
     }
 }
diff --git a/src/frontend/qt_sdl/TitleManagerDialog.cpp b/src/frontend/qt_sdl/TitleManagerDialog.cpp
index 30f29d24f4..ef6157e88a 100644
--- a/src/frontend/qt_sdl/TitleManagerDialog.cpp
+++ b/src/frontend/qt_sdl/TitleManagerDialog.cpp
@@ -125,7 +125,7 @@ void TitleManagerDialog::createTitleItem(u32 category, u32 titleid)
     *(u32*)&gamecode[0] = *(u32*)&header.GameCode[0];
     gamecode[4] = '\0';
     char extra[128];
-    sprintf(extra, "\n(title ID: %s · %08x/%08x · version %08x)", gamecode, category, titleid, version);
+    snprintf(extra, sizeof(extra), "\n(title ID: %s · %08x/%08x · version %08x)", gamecode, category, titleid, version);
 
     QListWidgetItem* item = new QListWidgetItem(title + QString(extra));
     item->setIcon(icon);
@@ -481,7 +481,7 @@ void TitleImportDialog::accept()
         network = new QNetworkAccessManager(this);
 
         char url[256];
-        sprintf(url, "http://nus.cdn.t.shop.nintendowifi.net/ccs/download/%08x%08x/tmd", titleid[1], titleid[0]);
+        snprintf(url, sizeof(url), "http://nus.cdn.t.shop.nintendowifi.net/ccs/download/%08x%08x/tmd", titleid[1], titleid[0]);
 
         QNetworkRequest req;
         req.setUrl(QUrl(url));
diff --git a/src/frontend/qt_sdl/WifiSettingsDialog.cpp b/src/frontend/qt_sdl/WifiSettingsDialog.cpp
index e0954c83b0..e041234b51 100644
--- a/src/frontend/qt_sdl/WifiSettingsDialog.cpp
+++ b/src/frontend/qt_sdl/WifiSettingsDialog.cpp
@@ -152,14 +152,14 @@ void WifiSettingsDialog::on_cbxDirectAdapter_currentIndexChanged(int sel)
     melonDS::AdapterData* adapter = &adapters[sel];
     char tmp[64];
 
-    sprintf(tmp, "%02X:%02X:%02X:%02X:%02X:%02X",
-            adapter->MAC[0], adapter->MAC[1], adapter->MAC[2],
-            adapter->MAC[3], adapter->MAC[4], adapter->MAC[5]);
+    snprintf(tmp, sizeof(tmp), "%02X:%02X:%02X:%02X:%02X:%02X",
+             adapter->MAC[0], adapter->MAC[1], adapter->MAC[2],
+             adapter->MAC[3], adapter->MAC[4], adapter->MAC[5]);
     ui->lblAdapterMAC->setText(QString(tmp));
 
-    sprintf(tmp, "%d.%d.%d.%d",
-            adapter->IP_v4[0], adapter->IP_v4[1],
-            adapter->IP_v4[2], adapter->IP_v4[3]);
+    snprintf(tmp, sizeof(tmp), "%d.%d.%d.%d",
+             adapter->IP_v4[0], adapter->IP_v4[1],
+             adapter->IP_v4[2], adapter->IP_v4[3]);
     ui->lblAdapterIP->setText(QString(tmp));
 }