diff --git a/src/gba/bios.c b/src/gba/bios.c
index c68119550..89d0d7cd1 100644
--- a/src/gba/bios.c
+++ b/src/gba/bios.c
@@ -10,10 +10,6 @@
 #include "gba/memory.h"
 #include "isa-inlines.h"
 
-#ifndef M_PI
-#define M_PI 3.141592654f
-#endif
-
 const uint32_t GBA_BIOS_CHECKSUM = 0xBAAE187F;
 const uint32_t GBA_DS_BIOS_CHECKSUM = 0xBAAE1880;
 
diff --git a/src/util/common.h b/src/util/common.h
index 0f9a90255..90746f082 100644
--- a/src/util/common.h
+++ b/src/util/common.h
@@ -23,4 +23,8 @@
 
 #define UNUSED(V) (void)(V)
 
+#ifndef M_PI
+#define M_PI 3.141592654f
+#endif
+
 #endif