diff --git a/src/cfg.c b/src/cfg.c
index e3ba2654..9b1d1d2f 100644
--- a/src/cfg.c
+++ b/src/cfg.c
@@ -1453,7 +1453,7 @@ int kvz_config_validate(const kvz_config *const cfg)
     error = 1;
   }
 
-  if (validate_hevc_level(cfg)) {
+  if (validate_hevc_level((kvz_config *const) cfg)) {
     // a level error found and it's not okay
     error = 1;
   }
@@ -1463,29 +1463,29 @@ int kvz_config_validate(const kvz_config *const cfg)
 
 static int validate_hevc_level(kvz_config *const cfg) {
   static const struct { uint32_t lsr; uint32_t lps; uint32_t main_bitrate; } LEVEL_CONSTRAINTS[13] = {
-    { 552'960, 36'864, 128 }, // 1
+    { 552960, 36864, 128 }, // 1
 
-    { 3'686'400, 122'880, 1500 }, // 2
-    { 7'372'800, 245'760, 3000 }, // 2.1
+    { 3686400, 122880, 1500 }, // 2
+    { 7372800, 245760, 3000 }, // 2.1
 
-    { 16'588'800, 552'960, 6000 },   // 3
-    { 33'177'600, 983'040, 10'000 }, // 3.1
+    { 16588800, 552960, 6000 },   // 3
+    { 33177600, 983040, 10000 }, // 3.1
 
-    { 66'846'720, 2'228'224, 12'000 },  // 4
-    { 133'693'440, 2'228'224, 20'000 }, // 4.1
+    { 66846720, 2228224, 12000 },  // 4
+    { 133693440, 2228224, 20000 }, // 4.1
 
-    { 267'386'880, 8'912'896, 25'000 },   // 5
-    { 534'773'760, 8'912'896, 40'000 },   // 5.1
-    { 1'069'547'520, 8'912'896, 60'000 }, // 5.2
+    { 267386880, 8912896, 25000 },   // 5
+    { 534773760, 8912896, 40000 },   // 5.1
+    { 1069547520, 8912896, 60000 }, // 5.2
 
-    { 1'069'547'520, 35'651'584, 60'000 },  // 6
-    { 2'139'095'040, 35'651'584, 120'000 }, // 6.1
-    { 4'278'190'080, 35'651'584, 240'000 }, // 6.2
+    { 1069547520, 35651584, 60000 },  // 6
+    { 2139095040, 35651584, 120000 }, // 6.1
+    { 4278190080, 35651584, 240000 }, // 6.2
   };
 
   // bit rates for the high-tiers of the levels from 4 to 6.2
   static const uint32_t HIGH_TIER_BITRATES[8] = {
-    30'000, 50'000, 100'000, 160'000, 240'000, 240'000, 480'000, 800'000
+    30000, 50000, 100000, 160000, 240000, 240000, 480000, 800000
   };
 
   int level_error = 0;