diff --git a/src/apu/Gb_Apu.cpp b/src/apu/Gb_Apu.cpp
index e3518846..87943f65 100644
--- a/src/apu/Gb_Apu.cpp
+++ b/src/apu/Gb_Apu.cpp
@@ -218,7 +218,7 @@ void Gb_Apu::run_until_( blip_time_t end_time )
 		case 6:
 			// 128 Hz
 			square1.clock_sweep();
-			[[fallthrough]];
+			/* fallthrough */
 		case 0:
 		case 4:
 			// 256 Hz
diff --git a/src/gba/Cheats.cpp b/src/gba/Cheats.cpp
index de41980d..d4c33662 100644
--- a/src/gba/Cheats.cpp
+++ b/src/gba/Cheats.cpp
@@ -1353,7 +1353,7 @@ void cheatsDelete(int number, bool restore)
                 } else {
                     CPUWriteMemory(cheatsList[x].address, cheatsList[x].oldValue);
                 }
-                [[fallthrough]];
+		/* fallthrough */
             case GSA_16_BIT_ROM_PATCH:
                 if (cheatsList[x].status & 1) {
                     cheatsList[x].status &= ~1;
diff --git a/src/gba/GBA.cpp b/src/gba/GBA.cpp
index 0cb453b0..8ef2a4b8 100644
--- a/src/gba/GBA.cpp
+++ b/src/gba/GBA.cpp
@@ -2248,7 +2248,7 @@ void CPUSoftwareInterrupt(int comment)
     case 0x2A:
         BIOS_SndDriverJmpTableCopy();
         // let it go, because we don't really emulate this function
-        [[fallthrough]];
+	/* fallthrough */
     default:
 #ifdef GBA_LOGGING
         if (systemVerbose & VERBOSE_SWI) {
diff --git a/src/gba/GBAinline.h b/src/gba/GBAinline.h
index 9f78cf0f..1c80323a 100644
--- a/src/gba/GBAinline.h
+++ b/src/gba/GBAinline.h
@@ -131,7 +131,7 @@ static inline uint32_t CPUReadMemory(uint32_t address)
             value = flashRead(address) * 0x01010101;
             break;
         }
-        [[fallthrough]];
+	/* fallthrough */
     default:
     unreadable:
 #ifdef GBA_LOGGING
@@ -281,7 +281,7 @@ static inline uint32_t CPUReadHalfWord(uint32_t address)
             value = flashRead(address) * 0x0101;
             break;
         }
-        [[fallthrough]];
+	/* fallthrough */
     default:
     unreadable:
         if (cpuDmaRunning|| ((reg[15].I - cpuDmaPC) == (armState ? 4 : 2))) {
@@ -407,7 +407,7 @@ static inline uint8_t CPUReadByte(uint32_t address)
         case 0x8500:
             return systemGetSensorY() >> 8;
         }
-        [[fallthrough]];
+	/* fallthrough */
     default:
     unreadable:
 #ifdef GBA_LOGGING
@@ -627,7 +627,7 @@ static inline void CPUWriteHalfWord(uint32_t address, uint16_t value)
             (*cpuSaveGameFunc)(address, (uint8_t)value);
             break;
         }
-        // fallthrough
+        /* fallthrough */
     default:
     unwritable:
 #ifdef GBA_LOGGING