diff --git a/Makefile b/Makefile
index 7c3d0e5404..7c3fdc42a5 100644
--- a/Makefile
+++ b/Makefile
@@ -51,15 +51,11 @@ endif
 # Version-specific settings
 ifeq ($(VERSION),gc-eu-mq)
   DEBUG := 0
-  CFLAGS += -DNON_MATCHING -DNDEBUG -DOOT_DEBUG=0
-  CPPFLAGS += -DNON_MATCHING -DNDEBUG -DOOT_DEBUG=0
-  OPTFLAGS := -O2 -g3
+  CFLAGS += -DNON_MATCHING
+  CPPFLAGS += -DNON_MATCHING
   COMPARE := 0
 else ifeq ($(VERSION),gc-eu-mq-dbg)
   DEBUG := 1
-  CFLAGS += -DOOT_DEBUG=1
-  CPPFLAGS += -DOOT_DEBUG=1
-  OPTFLAGS := -O2
 else
 $(error Unsupported version $(VERSION))
 endif
@@ -72,6 +68,16 @@ VENV := .venv
 MAKE = make
 CPPFLAGS += -fno-dollars-in-identifiers -P
 
+ifeq ($(DEBUG),1)
+  CFLAGS += -DOOT_DEBUG=1
+  CPPFLAGS += -DOOT_DEBUG=1
+  OPTFLAGS := -O2
+else
+  CFLAGS += -DNDEBUG -DOOT_DEBUG=0
+  CPPFLAGS += -DNDEBUG -DOOT_DEBUG=0
+  OPTFLAGS := -O2 -g3
+endif
+
 ifeq ($(OS),Windows_NT)
     DETECTED_OS=windows
 else
diff --git a/include/functions.h b/include/functions.h
index f38827d713..a067d97047 100644
--- a/include/functions.h
+++ b/include/functions.h
@@ -36,10 +36,14 @@ void Locale_ResetRegion(void);
 u32 func_80001F48(void);
 u32 func_80001F8C(void);
 u32 Locale_IsRegionNative(void);
+#if OOT_DEBUG
 void isPrintfInit(void);
+#endif
 void rmonPrintf(const char* fmt, ...);
+#if OOT_DEBUG
 void* is_proutSyncPrintf(void* arg, const char* str, size_t count);
 NORETURN void func_80002384(const char* exp, const char* file, u32 line);
+#endif
 OSPiHandle* osDriveRomInit(void);
 void Mio0_Decompress(Yaz0Header* hdr, u8* dst);
 void StackCheck_Init(StackEntry* entry, void* stackBottom, void* stackTop, u32 initValue, s32 minSpace,
diff --git a/src/boot/boot_main.c b/src/boot/boot_main.c
index fdba964e80..b8c08fe8ac 100644
--- a/src/boot/boot_main.c
+++ b/src/boot/boot_main.c
@@ -21,7 +21,9 @@ void bootproc(void) {
 
     gCartHandle = osCartRomInit();
     osDriveRomInit();
+#if OOT_DEBUG
     isPrintfInit();
+#endif
     Locale_Init();
 
     StackCheck_Init(&sIdleThreadInfo, sIdleThreadStack, STACK_TOP(sIdleThreadStack), 0, 256, "idle");
diff --git a/src/boot/is_debug.c b/src/boot/is_debug.c
index a47daecd2b..b5d077212a 100644
--- a/src/boot/is_debug.c
+++ b/src/boot/is_debug.c
@@ -5,18 +5,22 @@ OSPiHandle* sISVHandle; // official name : is_Handle
 #define gISVDbgPrnAdrs ((ISVDbg*)0xB3FF0000)
 #define ASCII_TO_U32(a, b, c, d) ((u32)((a << 24) | (b << 16) | (c << 8) | (d << 0)))
 
+#if OOT_DEBUG
 void isPrintfInit(void) {
     sISVHandle = osCartRomInit();
     osEPiWriteIo(sISVHandle, (u32)&gISVDbgPrnAdrs->put, 0);
     osEPiWriteIo(sISVHandle, (u32)&gISVDbgPrnAdrs->get, 0);
     osEPiWriteIo(sISVHandle, (u32)&gISVDbgPrnAdrs->magic, ASCII_TO_U32('I', 'S', '6', '4'));
 }
+#endif
 
 void osSyncPrintfUnused(const char* fmt, ...) {
     va_list args;
     va_start(args, fmt);
 
+#if OOT_DEBUG
     _Printf(is_proutSyncPrintf, NULL, fmt, args);
+#endif
 
     va_end(args);
 }
@@ -25,7 +29,9 @@ void osSyncPrintf(const char* fmt, ...) {
     va_list args;
     va_start(args, fmt);
 
+#if OOT_DEBUG
     _Printf(is_proutSyncPrintf, NULL, fmt, args);
+#endif
 
     va_end(args);
 }
@@ -35,11 +41,14 @@ void rmonPrintf(const char* fmt, ...) {
     va_list args;
     va_start(args, fmt);
 
+#if OOT_DEBUG
     _Printf(is_proutSyncPrintf, NULL, fmt, args);
+#endif
 
     va_end(args);
 }
 
+#if OOT_DEBUG
 void* is_proutSyncPrintf(void* arg, const char* str, size_t count) {
     u32 data;
     s32 pos;
@@ -92,3 +101,4 @@ NORETURN void func_80002384(const char* exp, const char* file, u32 line) {
         ;
     }
 }
+#endif