diff --git a/src/libCom/osi/osiInterrupt.h b/src/libCom/osi/osiInterrupt.h
index 85abf2e20..5b365d66e 100644
--- a/src/libCom/osi/osiInterrupt.h
+++ b/src/libCom/osi/osiInterrupt.h
@@ -9,9 +9,9 @@ extern "C" {
 
 #include "shareLib.h"
 
-epicsShareFunc int epicsShareAPI interruptLock();
+epicsShareFunc int epicsShareAPI interruptLock(void);
 epicsShareFunc void epicsShareAPI interruptUnlock(int key);
-epicsShareFunc int epicsShareAPI interruptIsInterruptContext();
+epicsShareFunc int epicsShareAPI interruptIsInterruptContext(void);
 epicsShareFunc void epicsShareAPI interruptContextMessage(const char *message);
 
 #ifdef __cplusplus
diff --git a/src/libCom/osi/osiPoolStatus.h b/src/libCom/osi/osiPoolStatus.h
index af09084bb..e19687c93 100644
--- a/src/libCom/osi/osiPoolStatus.h
+++ b/src/libCom/osi/osiPoolStatus.h
@@ -14,7 +14,7 @@
 extern "C" {
 #endif
 
-epicsShareFunc int epicsShareAPI osiSufficentSpaceInPool ();
+epicsShareFunc int epicsShareAPI osiSufficentSpaceInPool (void);
 
 #ifdef __cplusplus
 }