diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5ef0012f5..5fcc3d45b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,8 +1,10 @@
-## 2.1.26 (XXXX-XX-XX)
+## 2.1.26 (2019-03-14)
 
 ### Bug Fixes
 
 * Fixed a hardcoded log directory in BugZoo CLI.
+* Updated coverage instrumentation to use C90-compatible comments.
+* Update coverage instrumentation to support C.
 
 
 ## 2.1.25 (2019-02-09)
diff --git a/bugzoo/mgr/coverage/gcov.py b/bugzoo/mgr/coverage/gcov.py
index f7296743f..7d0ca1bbe 100644
--- a/bugzoo/mgr/coverage/gcov.py
+++ b/bugzoo/mgr/coverage/gcov.py
@@ -16,11 +16,15 @@
 logger.setLevel(logging.DEBUG)
 
 INSTRUMENTATION = (
-    "// BUGZOO :: INSTRUMENTATION :: START\n"
+    "/* BUGZOO :: INSTRUMENTATION :: START */\n"
     "#include <stdio.h>\n"
     "#include <stdlib.h>\n"
     "#include <signal.h>\n"
-    "extern \"C\" void __gcov_flush(void);\n"
+    "#ifdef __cplusplus\n"
+    "  extern \"C\" void __gcov_flush(void);\n"
+    "#else\n"
+    "  void __gcov_flush(void);\n"
+    "#endif\n"
     "void bugzoo_sighandler(int sig){\n"
     "  __gcov_flush();\n"
     "  if(sig != SIGUSR1 && sig != SIGUSR2)\n"
@@ -40,11 +44,11 @@
     "  sigaction(SIGBUS, &new_action, NULL);\n"
     "  sigaction(SIGILL, &new_action, NULL);\n"
     "  sigaction(SIGABRT, &new_action, NULL);\n"
-    "  // Use signal for SIGUSR to remove handlers\n"
+    "  /* Use signal for SIGUSR to remove handlers */\n"
     "  signal(SIGUSR1, bugzoo_sighandler);\n"
     "  signal(SIGUSR2, bugzoo_sighandler);\n"
     "}\n"
-    "// BUGZOO :: INSTRUMENTATION :: END\n"
+    "/* BUGZOO :: INSTRUMENTATION :: END */\n"
 )