diff --git a/CMake/PickyWarnings.cmake b/CMake/PickyWarnings.cmake
index 516246111f..cfe82b6db1 100644
--- a/CMake/PickyWarnings.cmake
+++ b/CMake/PickyWarnings.cmake
@@ -108,7 +108,7 @@ if(PICKY_COMPILER)
       -Wold-style-definition               # clang  2.7  gcc  3.4
       -Wredundant-decls                    # clang  2.7  gcc  4.1
       -Wsign-conversion                    # clang  2.9  gcc  4.3
-        -Wno-error=sign-conversion                                              # FIXME
+        -Wno-error=sign-conversion
       -Wstrict-prototypes                  # clang  1.0  gcc  3.3
     # -Wswitch-enum                        # clang  2.7  gcc  4.1               # Not used: It basically disallows default case
       -Wtype-limits                        # clang  2.7  gcc  4.3
diff --git a/lib/curl_setup.h b/lib/curl_setup.h
index b46b672d44..1727e2d794 100644
--- a/lib/curl_setup.h
+++ b/lib/curl_setup.h
@@ -31,7 +31,7 @@
 /* Tell "curl/curl.h" not to include "curl/mprintf.h" */
 #define CURL_SKIP_INCLUDE_MPRINTF
 
-/* FIXME: Delete this once the warnings have been fixed. */
+/* Make these warnings visible with an option. */
 #if !defined(CURL_WARN_SIGN_CONVERSION)
 #if defined(__GNUC__) || defined(__clang__)
 #pragma GCC diagnostic ignored "-Wsign-conversion"
diff --git a/m4/curl-compilers.m4 b/m4/curl-compilers.m4
index 994eb9c522..bb20b6ced9 100644
--- a/m4/curl-compilers.m4
+++ b/m4/curl-compilers.m4
@@ -844,7 +844,7 @@ AC_DEFUN([CURL_SET_COMPILER_WARNING_OPTS], [
           dnl Only clang 2.9 or later
           if test "$compiler_num" -ge "209"; then
             CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [sign-conversion])
-            tmp_CFLAGS="$tmp_CFLAGS -Wno-error=sign-conversion"          # FIXME
+            tmp_CFLAGS="$tmp_CFLAGS -Wno-error=sign-conversion"
             CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [shift-sign-overflow])
           # CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [padded])  # Not used because we cannot change public structs
           fi
@@ -1032,7 +1032,7 @@ AC_DEFUN([CURL_SET_COMPILER_WARNING_OPTS], [
             CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [clobbered ignored-qualifiers])
             CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [conversion trampolines])
             CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [sign-conversion])
-            tmp_CFLAGS="$tmp_CFLAGS -Wno-error=sign-conversion"          # FIXME
+            tmp_CFLAGS="$tmp_CFLAGS -Wno-error=sign-conversion"
             CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [vla])
             dnl required for -Warray-bounds, included in -Wall
             tmp_CFLAGS="$tmp_CFLAGS -ftree-vrp"