diff --git a/src/languages/c-noilinux.ts b/src/languages/c-noilinux.ts
index 1f50b0d..d20c31c 100644
--- a/src/languages/c-noilinux.ts
+++ b/src/languages/c-noilinux.ts
@@ -10,7 +10,7 @@ export const lang = {
         // write a shell script or some other stuff, 
         // and put it to your sandbox.
 	executable: "/usr/bin/compile-c-noilinux",
-	parameters: ["compile-c-noilinux", sourcePath, "-o", `${outputDirectory}/a.out`, "-O2", "-DONLINE_JUDGE"],
+	parameters: ["compile-c-noilinux", sourcePath, "-o", `${outputDirectory}/a.out`, "-O2", "-DONLINE_JUDGE", "-lm"],
         time: 5000,
         memory: 1024 * 1024 * 1024 * 2,
         process: 10,
diff --git a/src/languages/c.ts b/src/languages/c.ts
index 5b943b3..0f75d9c 100644
--- a/src/languages/c.ts
+++ b/src/languages/c.ts
@@ -10,7 +10,7 @@ export const lang =  {
         // write a shell script or some other stuff, 
         // and put it to your sandbox.
         executable: "/usr/bin/clang-7",
-        parameters: ["clang-7", sourcePath, "-o", `${outputDirectory}/a.out`, "-O2", "-fdiagnostics-color=always", "-DONLINE_JUDGE", "-mx32"],
+        parameters: ["clang-7", sourcePath, "-o", `${outputDirectory}/a.out`, "-O2", "-fdiagnostics-color=always", "-DONLINE_JUDGE", "-mx32", "-lm"],
         time: 5000,
         memory: 1024 * 1024 * 1024 * 2,
         process: 10,