diff --git a/core/libs/prx/libkernel/Semaphore/src/Semaphore.cpp b/core/libs/prx/libkernel/Semaphore/src/Semaphore.cpp
index 46490e9a7..8210cdb99 100644
--- a/core/libs/prx/libkernel/Semaphore/src/Semaphore.cpp
+++ b/core/libs/prx/libkernel/Semaphore/src/Semaphore.cpp
@@ -36,7 +36,7 @@ int APS5_VABI sceKernelPollSema(KernelSema sem, int need) {
 }
 
 int APS5_VABI sceKernelSignalSema(KernelSema sem, int count) {
- if (sem == nullptr || count <= 0) {
+ if (sem == nullptr || count < 0) {
   APS5_INVALID_ARG_EX;
  }
 
diff --git a/core/libs/tests/GuestKernelErrors.cpp b/core/libs/tests/GuestKernelErrors.cpp
index ddb8828a5..5c14f7fca 100644
--- a/core/libs/tests/GuestKernelErrors.cpp
+++ b/core/libs/tests/GuestKernelErrors.cpp
@@ -62,7 +62,10 @@ int main() {
     Require(sceKernelCreateSema(&semaphore, "limit", 1, 1, 3, nullptr) == SCE_OK);
     Require(sceKernelSignalSema(semaphore, 3) == SCE_KERNEL_ERROR_EINVAL);
     Require(sceKernelSignalSema(semaphore, 2) == SCE_OK);
+    Require(sceKernelSignalSema(semaphore, 0) == SCE_OK);
     Require(sceKernelPollSema(semaphore, 3) == SCE_OK);
+    Require(sceKernelSignalSema(semaphore, 0) == SCE_OK);
+    Require(sceKernelPollSema(semaphore, 1) == SCE_KERNEL_ERROR_EBUSY);
     Require(sceKernelDeleteSema(semaphore) == SCE_OK);
 
     KernelEqueue eq = 0;