diff --git a/historic/jam/src/pwd.c b/historic/jam/src/pwd.c
index 4fb67aabf..79fa1840b 100644
--- a/historic/jam/src/pwd.c
+++ b/historic/jam/src/pwd.c
@@ -5,7 +5,7 @@
 
 #include <limits.h>
 
-// MinGW on windows declares PATH_MAX in limits.h
+/* MinGW on windows declares PATH_MAX in limits.h */
 #if defined(NT) && ! defined(__GNUC__)
 #include <direct.h>
 #define PATH_MAX _MAX_PATH
diff --git a/jam_src/pwd.c b/jam_src/pwd.c
index 4fb67aabf..79fa1840b 100644
--- a/jam_src/pwd.c
+++ b/jam_src/pwd.c
@@ -5,7 +5,7 @@
 
 #include <limits.h>
 
-// MinGW on windows declares PATH_MAX in limits.h
+/* MinGW on windows declares PATH_MAX in limits.h */
 #if defined(NT) && ! defined(__GNUC__)
 #include <direct.h>
 #define PATH_MAX _MAX_PATH