diff --git a/lang/cem/cemcom.ansi/main.c b/lang/cem/cemcom.ansi/main.c
index f279b0738..3de7f6e3d 100644
--- a/lang/cem/cemcom.ansi/main.c
+++ b/lang/cem/cemcom.ansi/main.c
@@ -500,11 +500,13 @@ Info()
 }
 #endif /* DEBUG */
 
+void
 No_Mem()				/* called by alloc package */
 {
 	fatal("out of memory");
 }
 
+void
 C_failed()				/* called by EM_code module */
 {
 	fatal("write failed");
diff --git a/lang/cem/cemcom/main.c b/lang/cem/cemcom/main.c
index 20a0b4d30..eb3f5e327 100644
--- a/lang/cem/cemcom/main.c
+++ b/lang/cem/cemcom/main.c
@@ -469,11 +469,13 @@ preprocess()
 #endif /* NOPP */
 #endif /* DEBUG */
 
+void
 No_Mem()				/* called by alloc package */
 {
 	fatal("out of memory");
 }
 
+void
 C_failed()				/* called by EM_code module */
 {
 	fatal("write failed");
diff --git a/lang/cem/cpp.ansi/main.c b/lang/cem/cpp.ansi/main.c
index b95021629..c7657036c 100644
--- a/lang/cem/cpp.ansi/main.c
+++ b/lang/cem/cpp.ansi/main.c
@@ -151,6 +151,7 @@ dependency(s, source)
 	else	fprint(dep_fd, "%s\n", s);
 }
 
+void
 No_Mem()				/* called by alloc package */
 {
 	fatal("out of memory");
diff --git a/lang/m2/m2mm/main.c b/lang/m2/m2mm/main.c
index ae222c916..a803ad99f 100644
--- a/lang/m2/m2mm/main.c
+++ b/lang/m2/m2mm/main.c
@@ -208,6 +208,7 @@ ProcessArgs()
 	}
 }
 
+void
 No_Mem()
 {
 	fatal("out of memory");
diff --git a/lang/occam/comp/occam.g b/lang/occam/comp/occam.g
index 73a7c738c..88d55c456 100644
--- a/lang/occam/comp/occam.g
+++ b/lang/occam/comp/occam.g
@@ -749,6 +749,7 @@ static void check_assoc(prev_op, op) register prev_op, op;
 	}
 }
 
+void
 No_Mem()
 {
 	fatal("out of memory");