diff --git a/netwerk/test/TestSocketTransport.cpp b/netwerk/test/TestSocketTransport.cpp
index 4c8ec34ce586..261ac32245db 100644
--- a/netwerk/test/TestSocketTransport.cpp
+++ b/netwerk/test/TestSocketTransport.cpp
@@ -625,8 +625,8 @@ main(int argc, char* argv[])
   printf("Using %s as echo server...\n", hostName);
 
 #ifdef XP_MAC
-	(void) PR_PutEnv("NSPR_LOG_MODULES=nsSocketTransport:5");
-	(void) PR_PutEnv("NSPR_LOG_FILE=nspr.log");
+	(void) PR_SetEnv("NSPR_LOG_MODULES=nsSocketTransport:5");
+	(void) PR_SetEnv("NSPR_LOG_FILE=nspr.log");
 	PR_Init_Log();
 #endif
 
diff --git a/xpfe/appshell/src/nsCommandLineServiceMac.cpp b/xpfe/appshell/src/nsCommandLineServiceMac.cpp
index 65af7245e2ef..39a381b14f0f 100644
--- a/xpfe/appshell/src/nsCommandLineServiceMac.cpp
+++ b/xpfe/appshell/src/nsCommandLineServiceMac.cpp
@@ -206,7 +206,7 @@ nsresult nsMacCommandLine::AddToCommandLine(const char* inOptionString, const FS
 nsresult nsMacCommandLine::AddToEnvironmentVars(const char* inArgText)
 //----------------------------------------------------------------------------------------
 {
-  (void)PR_PutEnv(inArgText);
+  (void)PR_SetEnv(inArgText);
   return NS_OK;
 }
 
diff --git a/xpfe/components/startup/src/nsCommandLineServiceMac.cpp b/xpfe/components/startup/src/nsCommandLineServiceMac.cpp
index 65af7245e2ef..39a381b14f0f 100644
--- a/xpfe/components/startup/src/nsCommandLineServiceMac.cpp
+++ b/xpfe/components/startup/src/nsCommandLineServiceMac.cpp
@@ -206,7 +206,7 @@ nsresult nsMacCommandLine::AddToCommandLine(const char* inOptionString, const FS
 nsresult nsMacCommandLine::AddToEnvironmentVars(const char* inArgText)
 //----------------------------------------------------------------------------------------
 {
-  (void)PR_PutEnv(inArgText);
+  (void)PR_SetEnv(inArgText);
   return NS_OK;
 }