diff --git a/mupen64plus-core/src/device/r4300/dcache.c b/mupen64plus-core/src/device/r4300/dcache.c
index 831b1e9..0147324 100644
--- a/mupen64plus-core/src/device/r4300/dcache.c
+++ b/mupen64plus-core/src/device/r4300/dcache.c
@@ -34,7 +34,7 @@ void poweron_dcache(struct datacache *lines)
 
 void dcache_writeback(struct r4300_core* r4300, struct datacache *line)
 {
-    cp0_dcb_interlock(r4300, rdram_calculate_cycles(20));
+    cp0_dcb_interlock(r4300, rdram_calculate_cycles(16));
     line->dirty = 0;
     uint32_t cache_address = (line->tag | line->index) & UINT32_C(0x1ffffffc);
     invalidate_r4300_cached_code(r4300, R4300_KSEG0 + cache_address, 16);
diff --git a/mupen64plus-core/src/device/r4300/icache.c b/mupen64plus-core/src/device/r4300/icache.c
index 41600cd..a3d9dc1 100644
--- a/mupen64plus-core/src/device/r4300/icache.c
+++ b/mupen64plus-core/src/device/r4300/icache.c
@@ -35,7 +35,7 @@ void poweron_icache(struct instcache *lines)
 
 void icache_writeback(struct r4300_core* r4300, struct instcache *line)
 {
-    cp0_icb_interlock(r4300, rdram_calculate_cycles(40));
+    cp0_icb_interlock(r4300, rdram_calculate_cycles(32));
     uint32_t cache_address = (line->tag | line->index) & UINT32_C(0x1ffffffc);
     invalidate_r4300_cached_code(r4300, R4300_KSEG0 + cache_address, 32);
     invalidate_r4300_cached_code(r4300, R4300_KSEG1 + cache_address, 32);