diff --git a/cmdparse.c b/cmdparse.c
index 9202d76..e84bca9 100644
--- a/cmdparse.c
+++ b/cmdparse.c
@@ -40,7 +40,7 @@
 /* ================================================== */
 
 #define SSCANF_IN_RANGE(s, f, x, n, min, max) \
-  (sscanf(s, f, (x), (n)) == 1 && *(x) >= (min) && *(x) <= (max))
+  (sscanf((s), (f), (x), (n)) == 1 && *(x) >= (min) && *(x) <= (max))
 
 /* ================================================== */
 
diff --git a/conf.c b/conf.c
index 1e023fc..cd3466b 100644
--- a/conf.c
+++ b/conf.c
@@ -51,7 +51,7 @@
 #define MAX_INCLUDE_LEVEL 10
 
 #define SSCANF_IN_RANGE(s, f, x, n, min, max) \
-  (sscanf(s, f, (x), (n)) == 1 && *(x) >= (min) && *(x) <= (max))
+  (sscanf((s), (f), (x), (n)) == 1 && *(x) >= (min) && *(x) <= (max))
 
 /* ================================================== */
 /* Forward prototypes */