diff --git a/gdb/source.c b/gdb/source.c
index 71da396acc8..f865c8a9508 100644
--- a/gdb/source.c
+++ b/gdb/source.c
@@ -233,13 +233,7 @@ clear_current_source_symtab_and_line (void)
   current_source_line = 0;
 }
 
-/* Set the source file default for the "list" command to be S.
-
-   If S is NULL, and we don't have a default, find one.  This
-   should only be called when the user actually tries to use the
-   default, since we produce an error if we can't find a reasonable
-   default.  Also, since this can cause symbols to be read, doing it
-   before we need to would make things slower than necessary.  */
+/* See source.h.  */
 
 void
 select_source_symtab (struct symtab *s)
@@ -351,8 +345,7 @@ show_directories_command (struct ui_file *file, int from_tty,
   show_directories_1 (NULL, from_tty);
 }
 
-/* Forget line positions and file names for the symtabs in a
-   particular objfile.  */
+/* See source.h.  */
 
 void
 forget_cached_source_info_for_objfile (struct objfile *objfile)
@@ -378,9 +371,7 @@ forget_cached_source_info_for_objfile (struct objfile *objfile)
     objfile->sf->qf->forget_cached_source_info (objfile);
 }
 
-/* Forget what we learned about line positions in source files, and
-   which directories contain them; must check again now since files
-   may be found in a different directory now.  */
+/* See source.h.  */
 
 void
 forget_cached_source_info (void)
@@ -1226,14 +1217,7 @@ get_filename_and_charpos (struct symtab *s, char **fullname)
     find_source_lines (s, desc.get ());
 }
 
-/* Print text describing the full name of the source file S
-   and the line number LINE and its corresponding character position.
-   The text starts with two Ctrl-z so that the Emacs-GDB interface
-   can easily find it.
-
-   MID_STATEMENT is nonzero if the PC is not at the beginning of that line.
-
-   Return 1 if successful, 0 if could not find the file.  */
+/* See source.h.  */
 
 int
 identify_source_line (struct symtab *s, int line, int mid_statement,
@@ -1406,10 +1390,8 @@ print_source_lines_base (struct symtab *s, int line, int stopline,
     uiout->text ("\n");
 }
 
-/* Show source lines from the file of symtab S, starting with line
-   number LINE and stopping before line number STOPLINE.  If this is
-   not the command line version, then the source is shown in the source
-   window otherwise it is simply printed.  */
+
+/* See source.h.  */
 
 void
 print_source_lines (struct symtab *s, int line, int stopline,
diff --git a/gdb/source.h b/gdb/source.h
index 05148f37c75..fcd83daafcd 100644
--- a/gdb/source.h
+++ b/gdb/source.h
@@ -127,4 +127,52 @@ extern void clear_current_source_symtab_and_line (void);
 
 /* Add a source path substitution rule.  */
 extern void add_substitute_path_rule (char *, char *);
+
+/* Print text describing the full name of the source file S
+   and the line number LINE and its corresponding character position.
+   The text starts with two Ctrl-z so that the Emacs-GDB interface
+   can easily find it.
+
+   MID_STATEMENT is nonzero if the PC is not at the beginning of that line.
+
+   Return 1 if successful, 0 if could not find the file.  */
+extern int identify_source_line (struct symtab *s, int line,
+				 int mid_statement, CORE_ADDR pc);
+
+/* Flags passed as 4th argument to print_source_lines.  */
+enum print_source_lines_flag
+  {
+    /* Do not print an error message.  */
+    PRINT_SOURCE_LINES_NOERROR = (1 << 0),
+
+    /* Print the filename in front of the source lines.  */
+    PRINT_SOURCE_LINES_FILENAME = (1 << 1)
+  };
+DEF_ENUM_FLAGS_TYPE (enum print_source_lines_flag, print_source_lines_flags);
+
+/* Show source lines from the file of symtab S, starting with line
+   number LINE and stopping before line number STOPLINE.  If this is
+   not the command line version, then the source is shown in the source
+   window otherwise it is simply printed.  */
+extern void print_source_lines (struct symtab *s, int line, int stopline,
+				print_source_lines_flags flags);
+
+/* Forget line positions and file names for the symtabs in a
+   particular objfile.  */
+extern void forget_cached_source_info_for_objfile (struct objfile *);
+
+/* Forget what we learned about line positions in source files, and
+   which directories contain them; must check again now since files
+   may be found in a different directory now.  */
+extern void forget_cached_source_info (void);
+
+/* Set the source file default for the "list" command to be S.
+
+   If S is NULL, and we don't have a default, find one.  This
+   should only be called when the user actually tries to use the
+   default, since we produce an error if we can't find a reasonable
+   default.  Also, since this can cause symbols to be read, doing it
+   before we need to would make things slower than necessary.  */
+extern void select_source_symtab (struct symtab *s);
+
 #endif
diff --git a/gdb/symtab.h b/gdb/symtab.h
index 414d167f3e9..c2d8a69cf9f 100644
--- a/gdb/symtab.h
+++ b/gdb/symtab.h
@@ -1882,30 +1882,6 @@ extern void resolve_sal_pc (struct symtab_and_line *);
 
 extern void clear_solib (void);
 
-/* source.c */
-
-extern int identify_source_line (struct symtab *, int, int, CORE_ADDR);
-
-/* Flags passed as 4th argument to print_source_lines.  */
-
-enum print_source_lines_flag
-  {
-    /* Do not print an error message.  */
-    PRINT_SOURCE_LINES_NOERROR = (1 << 0),
-
-    /* Print the filename in front of the source lines.  */
-    PRINT_SOURCE_LINES_FILENAME = (1 << 1)
-  };
-DEF_ENUM_FLAGS_TYPE (enum print_source_lines_flag, print_source_lines_flags);
-
-extern void print_source_lines (struct symtab *, int, int,
-				print_source_lines_flags);
-
-extern void forget_cached_source_info_for_objfile (struct objfile *);
-extern void forget_cached_source_info (void);
-
-extern void select_source_symtab (struct symtab *);
-
 /* The reason we're calling into a completion match list collector
    function.  */
 enum class complete_symbol_mode
diff --git a/gdb/tui/tui-hooks.c b/gdb/tui/tui-hooks.c
index b8c18a3216d..98c6fd651fa 100644
--- a/gdb/tui/tui-hooks.c
+++ b/gdb/tui/tui-hooks.c
@@ -33,6 +33,7 @@
 #include "ui-out.h"
 #include "top.h"
 #include "observable.h"
+#include "source.h"
 #include <unistd.h>
 #include <fcntl.h>
 
