diff --git a/solaris/SolarisProcess.c b/solaris/SolarisProcess.c
index e3597360..e691494e 100644
--- a/solaris/SolarisProcess.c
+++ b/solaris/SolarisProcess.c
@@ -101,7 +101,7 @@ void SolarisProcess_writeField(const Process* this, RichString* str, ProcessFiel
    RichString_appendWide(str, attr, buffer);
 }
 
-long SolarisProcess_compareByKey(const void* v1, const void* v2, ProcessField key) {
+long SolarisProcess_compareByKey(const Process* v1, const Process* v2, ProcessField key) {
    const SolarisProcess* p1 = (const SolarisProcess*)v1;
    const SolarisProcess* p2 = (const SolarisProcess*)v2;