diff --git a/src/detection/cpu/cpu_windows.c b/src/detection/cpu/cpu_windows.c
index 534ec74b4..6a4d8195e 100644
--- a/src/detection/cpu/cpu_windows.c
+++ b/src/detection/cpu/cpu_windows.c
@@ -139,7 +139,7 @@ static const char* detectByRegistry(FFCPUResult* cpu)
     if(!ffRegOpenKeyForRead(HKEY_LOCAL_MACHINE, L"HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &hKey, NULL))
         return "ffRegOpenKeyForRead(HKEY_LOCAL_MACHINE, L\"HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0\", &hKey, NULL) failed";
 
-    if (detectSpeedByCpuid(cpu) == NULL && cpu->frequencyBase == 0)
+    if (detectSpeedByCpuid(cpu) != NULL || cpu->frequencyBase != cpu->frequencyBase)
     {
         uint32_t mhz;
         if(ffRegReadUint(hKey, L"~MHz", &mhz, NULL))
@@ -167,7 +167,7 @@ const char* ffDetectCPUImpl(const FFCPUOptions* options, FFCPUResult* cpu)
     if (error)
         return error;
 
-    if (cpu->frequencyMax == 0)
+    if (cpu->frequencyMax != cpu->frequencyMax)
         detectMaxSpeedBySmbios(cpu);
 
     if(options->temp)